diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8a51b8f6..6a0a986b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -27,6 +27,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 - Removed >0 watts requirement to compute ERG.
+- Removed sizes for JSON strings since they're dynamic now. 
+- Added variable inactivity timeout. 
 - Filter cadence for crazy values. Only >0 && <250 now accepted.
 - Filter watts for crazy values. Only >0 && <3000 now accepted. 
 - Fixed bug where scans may not happen even when configured devices aren't connected.  
diff --git a/data/settings.html b/data/settings.html
index 836446cd..bd0bcac6 100644
--- a/data/settings.html
+++ b/data/settings.html
@@ -179,6 +179,15 @@ <h2>Reset to Defaults?</h2>
         tooltip: 'Use cadence to calculate power output',
         tooltipText: 'Use the PowerTable for Power instead of PM',
         defaultValue: false
+      },
+      inactivityTimeout: {
+        type: 'slider',
+        title: 'Inactivity Reboot Timeout',
+        tooltip: 'Idle time before auto-reboot',
+        tooltipText: 'Automatically reboot if device is inactive (no power, HR, or cadence changes) for this duration. Minimum 1 minute, maximum 48 hours.',
+        min: 1, max: 2880, step: 15,
+        defaultValue: 30,
+        unit: 'min'
       }
     };
 
diff --git a/include/BLE_Custom_Characteristic.h b/include/BLE_Custom_Characteristic.h
index 441fe4ad..983f4901 100644
--- a/include/BLE_Custom_Characteristic.h
+++ b/include/BLE_Custom_Characteristic.h
@@ -63,6 +63,7 @@ const uint8_t BLE_hMax                  = 0x2B;  // Maximum homing value
 const uint8_t BLE_homingSensitivity     = 0x2C;  // Homing sensitivity value
 const uint8_t BLE_pTab4Pwr              = 0x2D;  // Use power values for power table
 const uint8_t BLE_UDPLogging            = 0x2E;  // Enable or disable UDP logging
+const uint8_t BLE_inactivityTimeout     = 0x2F;  // Inactivity reboot timeout in minutes
 
 class BLE_ss2kCustomCharacteristic {
  public:
diff --git a/include/SmartSpin_parameters.h b/include/SmartSpin_parameters.h
index 1fd58f1e..31ff7333 100644
--- a/include/SmartSpin_parameters.h
+++ b/include/SmartSpin_parameters.h
@@ -139,6 +139,7 @@ class userParameters {
   int32_t hMax               = INT32_MIN;
   bool FTMSControlPointWrite = false;
   int homingSensitivity      = DEFAULT_HOMING_SENSITIVITY;  // Use default from settings.h
+  int inactivityTimeout = DEFAULT_INACTIVITY_TIMEOUT;
   String ssid;
   String password;
   String connectedPowerMeter   = CONNECTED_POWER_METER;
@@ -225,6 +226,18 @@ class userParameters {
   void setHomingSensitivity(int sensitivity) { homingSensitivity = sensitivity; }
   int getHomingSensitivity() { return homingSensitivity; }
 
+  void setInactivityTimeout(unsigned long timeout) {
+    // Clamp value between min and max
+    if (timeout < MIN_INACTIVITY_TIMEOUT) {
+      inactivityTimeout = MIN_INACTIVITY_TIMEOUT;
+    } else if (timeout > MAX_INACTIVITY_TIMEOUT) {
+      inactivityTimeout = MAX_INACTIVITY_TIMEOUT;
+    } else {
+      inactivityTimeout = timeout;
+    }
+  }
+  unsigned long getInactivityTimeout() { return inactivityTimeout; }
+
   void setDefaults();
   String returnJSON();
   void saveToLittleFS();
diff --git a/include/settings.h b/include/settings.h
index afc2d535..2c619a44 100644
--- a/include/settings.h
+++ b/include/settings.h
@@ -103,6 +103,12 @@ const char* const DEFAULT_PASSWORD = "password";
 // This is used to set the upper travel limit for the motor.
 #define DEFAULT_MAX_WATTS 1000
 
+// Inactivity timeout for automatic reboot
+// Time in minutes before reboot when no activity is detected
+#define DEFAULT_INACTIVITY_TIMEOUT 30
+#define MIN_INACTIVITY_TIMEOUT 1
+#define MAX_INACTIVITY_TIMEOUT 2880 // 48 hours
+
 // Minimum resistance on a Peloton Bike.
 // This is used to set the lower travel limit for the motor.
 #define MIN_PELOTON_RESISTANCE 5
@@ -264,15 +270,6 @@ constexpr const char* ANY = "any";
 // The client will be disconnected.
 #define BLE_CLIENT_DISCONNECT_TIMEOUT 5000
 
-#ifndef DEBUG_LOG_BUFFER_SIZE
-#define DEBUG_LOG_BUFFER_SIZE 600
-#endif
-
-// Max size of userconfig
-#define USERCONFIG_JSON_SIZE 2000 + DEBUG_LOG_BUFFER_SIZE
-
-#define RUNTIMECONFIG_JSON_SIZE 1000 + DEBUG_LOG_BUFFER_SIZE
-
 // Uncomment to use guardrails for ERG mode in the stepper loop.
 // #define ERG_GUARDRAILS
 
diff --git a/src/BLE_Custom_Characteristic.cpp b/src/BLE_Custom_Characteristic.cpp
index ecef6582..cd09e8dc 100644
--- a/src/BLE_Custom_Characteristic.cpp
+++ b/src/BLE_Custom_Characteristic.cpp
@@ -88,7 +88,7 @@ This characteristic allows for reading and writing various user configuration pa
 #include <BLE_Custom_Characteristic.h>
 #include <Constants.h>
 
-void BLE_ss2kCustomCharacteristic::setupService(NimBLEServer *pServer) {
+void BLE_ss2kCustomCharacteristic::setupService(NimBLEServer* pServer) {
   pSmartSpin2kService = spinBLEServer.pServer->createService(SMARTSPIN2K_SERVICE_UUID);
   smartSpin2kCharacteristic =
       pSmartSpin2kService->createCharacteristic(SMARTSPIN2K_CHARACTERISTIC_UUID, NIMBLE_PROPERTY::WRITE | NIMBLE_PROPERTY::INDICATE | NIMBLE_PROPERTY::NOTIFY);
@@ -99,17 +99,17 @@ void BLE_ss2kCustomCharacteristic::setupService(NimBLEServer *pServer) {
 
 void BLE_ss2kCustomCharacteristic::update() {}
 
-void ss2kCustomCharacteristicCallbacks::onWrite(NimBLECharacteristic *pCharacteristic, NimBLEConnInfo &connInfo) {
+void ss2kCustomCharacteristicCallbacks::onWrite(NimBLECharacteristic* pCharacteristic, NimBLEConnInfo& connInfo) {
   std::string rxValue = pCharacteristic->getValue();
   // SS2K_LOG(CUSTOM_CHAR_LOG_TAG, "Write from %s", connInfo.getAddress().toString().c_str());
   BLE_ss2kCustomCharacteristic::process(rxValue);
 }
 
-void ss2kCustomCharacteristicCallbacks::onSubscribe(NimBLECharacteristic *pCharacteristic, NimBLEConnInfo &connInfo, uint16_t subValue) {
+void ss2kCustomCharacteristicCallbacks::onSubscribe(NimBLECharacteristic* pCharacteristic, NimBLEConnInfo& connInfo, uint16_t subValue) {
   SS2K_LOG(CUSTOM_CHAR_LOG_TAG, "Subscribe from %s", connInfo.getAddress().toString().c_str());
   NimBLEDevice::setMTU(515);
 }
-void ss2kCustomCharacteristicCallbacks::onStatus(NimBLECharacteristic *pCharacteristic, int code) {
+void ss2kCustomCharacteristicCallbacks::onStatus(NimBLECharacteristic* pCharacteristic, int code) {
 // loop through and accumulate the data into a C++ string
 #ifdef CUSTOM_CHAR_DEBUG
   std::string characteristicValue = pCharacteristic->getValue();
@@ -137,8 +137,8 @@ void BLE_ss2kCustomCharacteristic::process(std::string rxValue) {
   if (NimBLEDevice::getServer()->getServiceByUUID(SMARTSPIN2K_SERVICE_UUID) == nullptr) {
     return;
   }
-  NimBLECharacteristic *pCharacteristic = NimBLEDevice::getServer()->getServiceByUUID(SMARTSPIN2K_SERVICE_UUID)->getCharacteristic(SMARTSPIN2K_CHARACTERISTIC_UUID);
-  uint8_t *pData                        = reinterpret_cast<uint8_t *>(&rxValue[0]);
+  NimBLECharacteristic* pCharacteristic = NimBLEDevice::getServer()->getServiceByUUID(SMARTSPIN2K_SERVICE_UUID)->getCharacteristic(SMARTSPIN2K_CHARACTERISTIC_UUID);
+  uint8_t* pData                        = reinterpret_cast<uint8_t*>(&rxValue[0]);
 
 #ifdef CUSTOM_CHAR_DEBUG
 #define LOG_BUF_APPEND(...) logBufLength += snprintf(logBuf + logBufLength, kLogBufCapacity - logBufLength, __VA_ARGS__)
@@ -166,7 +166,7 @@ void BLE_ss2kCustomCharacteristic::process(std::string rxValue) {
         returnString   = userConfig->getFirmwareUpdateURL();
       } else if (rxValue[0] == cc_write) {
         returnValue[0] = cc_success;
-        String str     = (char *)pData;
+        String str     = (char*)pData;
         str.remove(0, 2);
         userConfig->setFirmwareUpdateURL(str);
         LOG_BUF_APPEND("(%s)", userConfig->getFirmwareUpdateURL());
@@ -257,7 +257,7 @@ void BLE_ss2kCustomCharacteristic::process(std::string rxValue) {
         returnString   = userConfig->getDeviceName();
       } else if (rxValue[0] == cc_write) {
         returnValue[0] = cc_success;
-        String str     = (char *)pData;
+        String str     = (char*)pData;
         str.remove(0, 2);
         userConfig->setDeviceName(str);
         LOG_BUF_APPEND("(%s)", userConfig->getDeviceName());
@@ -420,7 +420,7 @@ void BLE_ss2kCustomCharacteristic::process(std::string rxValue) {
         returnString   = userConfig->getSsid();
       } else if (rxValue[0] == cc_write) {
         returnValue[0] = cc_success;
-        String str     = (char *)pData;
+        String str     = (char*)pData;
         str.remove(0, 2);
         userConfig->setSsid(str);
         LOG_BUF_APPEND("(%s)", userConfig->getSsid());
@@ -434,7 +434,7 @@ void BLE_ss2kCustomCharacteristic::process(std::string rxValue) {
         returnString   = userConfig->getPassword();
       } else if (rxValue[0] == cc_write) {
         returnValue[0] = cc_success;
-        String str     = (char *)pData;
+        String str     = (char*)pData;
         str.remove(0, 2);
         userConfig->setPassword(str);
         LOG_BUF_APPEND("(%s)", "******");
@@ -448,7 +448,7 @@ void BLE_ss2kCustomCharacteristic::process(std::string rxValue) {
         returnString   = userConfig->getFoundDevices();
       } else if (rxValue[0] == cc_write) {
         returnValue[0] = cc_success;
-        String str     = (char *)pData;
+        String str     = (char*)pData;
         str.remove(0, 2);
         userConfig->setFoundDevices(str);
         LOG_BUF_APPEND("(%s)", userConfig->getFoundDevices());
@@ -462,7 +462,7 @@ void BLE_ss2kCustomCharacteristic::process(std::string rxValue) {
         returnString   = userConfig->getConnectedPowerMeter();
       } else if (rxValue[0] == cc_write) {
         returnValue[0] = cc_success;
-        String str     = (char *)pData;
+        String str     = (char*)pData;
         str.remove(0, 2);
         userConfig->setConnectedPowerMeter(str);
         LOG_BUF_APPEND("(%s)", userConfig->getConnectedPowerMeter());
@@ -476,7 +476,7 @@ void BLE_ss2kCustomCharacteristic::process(std::string rxValue) {
         returnString   = userConfig->getConnectedHeartMonitor();
       } else if (rxValue[0] == cc_write) {
         returnValue[0] = cc_success;
-        String str     = (char *)pData;
+        String str     = (char*)pData;
         str.remove(0, 2);
         userConfig->setConnectedHeartMonitor(str);
         LOG_BUF_APPEND("(%s)", userConfig->getConnectedHeartMonitor());
@@ -758,7 +758,7 @@ void BLE_ss2kCustomCharacteristic::process(std::string rxValue) {
       }
       if (rxValue[0] == cc_write) {
         returnValue[0] = cc_success;
-        int32_t hMin = int32_t((uint8_t)(rxValue[2]) << 0 | (uint8_t)(rxValue[3]) << 8 | (uint8_t)(rxValue[4]) << 16 | (uint8_t)(rxValue[5]) << 24);
+        int32_t hMin   = int32_t((uint8_t)(rxValue[2]) << 0 | (uint8_t)(rxValue[3]) << 8 | (uint8_t)(rxValue[4]) << 16 | (uint8_t)(rxValue[5]) << 24);
         userConfig->setHMin(hMin);
         rtConfig->setMinStep(hMin);
         LOG_BUF_APPEND(" (%d)", hMin);
@@ -828,6 +828,25 @@ void BLE_ss2kCustomCharacteristic::process(std::string rxValue) {
       }
       break;
 
+    case BLE_inactivityTimeout: {  // 0x2F
+      LOG_BUF_APPEND("<-inactivityTimeout");
+      int timeout = userConfig->getInactivityTimeout();
+      if (rxValue[0] == cc_read) {
+        returnValue[0] = cc_success;
+        returnValue[2] = (uint8_t)(timeout & 0xff);
+        returnValue[3] = (uint8_t)((timeout >> 8) & 0xff);
+        returnValue[4] = (uint8_t)((timeout >> 16) & 0xff);
+        returnValue[5] = (uint8_t)((timeout >> 24) & 0xff);
+        returnLength += 4;
+      }
+      if (rxValue[0] == cc_write) {
+        returnValue[0] = cc_success;
+        int newTimeout = rxValue[2] | (rxValue[3] << 8) | (rxValue[4] << 16) | (rxValue[5] << 24);
+        userConfig->setInactivityTimeout(newTimeout);
+        LOG_BUF_APPEND("(%d min)", userConfig->getInactivityTimeout());
+      }
+    } break;
+
     default:
       LOG_BUF_APPEND("<-Unknown Characteristic");
       returnValue[0] = cc_error;
@@ -1015,4 +1034,9 @@ void BLE_ss2kCustomCharacteristic::parseNemit() {
     BLE_ss2kCustomCharacteristic::notify(BLE_UDPLogging);
     return;
   }
+  if (userConfig->getInactivityTimeout() != _oldParams.getInactivityTimeout()) {
+    _oldParams.setInactivityTimeout(userConfig->getInactivityTimeout());
+    BLE_ss2kCustomCharacteristic::notify(BLE_inactivityTimeout);
+    return;
+  }
 }
diff --git a/src/HTTP_Server_Basic.cpp b/src/HTTP_Server_Basic.cpp
index dbb14cc2..0bf76056 100644
--- a/src/HTTP_Server_Basic.cpp
+++ b/src/HTTP_Server_Basic.cpp
@@ -657,6 +657,12 @@ void HTTP_Server::settingsProcessor() {
       userConfig->setPowerCorrectionFactor(powerCorrectionFactor);
     }
   }
+  if (!server.arg("inactivityTimeout").isEmpty()) {
+    uint64_t inactivityTimeout = server.arg("inactivityTimeout").toInt();
+    if (inactivityTimeout >= MIN_INACTIVITY_TIMEOUT && inactivityTimeout <= MAX_INACTIVITY_TIMEOUT) {
+      userConfig->setInactivityTimeout(inactivityTimeout);
+    }
+  }
   if (!server.arg("blePMDropdown").isEmpty()) {
     wasBTUpdate = true;
     if (server.arg("blePMDropdown")) {
diff --git a/src/Main.cpp b/src/Main.cpp
index 5dd92226..ca82dde1 100644
--- a/src/Main.cpp
+++ b/src/Main.cpp
@@ -296,9 +296,9 @@ void SS2K::maintenanceLoop(void* pvParameters) {
       static float _oldTargetIncline = 0.0f;
       if (_oldHR == rtConfig->hr.getValue() && _oldWatts == rtConfig->watts.getValue() && _oldTargetIncline == rtConfig->getTargetIncline()) {
         // Inactivity detected
-        if (((millis() - rebootTimer) > 1800000)) {
+        if (((millis() - rebootTimer) > userConfig->getInactivityTimeout() * 60000)) {
           // Timer expired
-          SS2K_LOG(MAIN_LOG_TAG, "Rebooting due to inactivity.");
+          SS2K_LOG(MAIN_LOG_TAG, "Rebooting due to inactivity. Timeout: %d min", userConfig->getInactivityTimeout());
           ss2k->rebootFlag = true;
           logHandler.writeLogs();
           webSocketAppender.Loop();
diff --git a/src/SmartSpin_parameters.cpp b/src/SmartSpin_parameters.cpp
index 25fe1c68..e3b63b26 100644
--- a/src/SmartSpin_parameters.cpp
+++ b/src/SmartSpin_parameters.cpp
@@ -71,6 +71,7 @@ void userParameters::setDefaults() {
   hMin                  = INT32_MIN;
   hMax                  = INT32_MIN;
   homingSensitivity     = DEFAULT_HOMING_SENSITIVITY;
+  inactivityTimeout     = DEFAULT_INACTIVITY_TIMEOUT;
 }
 
 //---------------------------------------------------------------------------------
@@ -108,6 +109,7 @@ String userParameters::returnJSON() {
   doc["hMin"]                  = hMin;
   doc["hMax"]                  = hMax;
   doc["homingSensitivity"]     = homingSensitivity;
+  doc["inactivityTimeout"]     = inactivityTimeout;
 
   String output;
   serializeJson(doc, output);
@@ -160,6 +162,7 @@ void userParameters::saveToLittleFS() {
   doc["hMin"]          = hMin;
   doc["hMax"]          = hMax;
   doc["homingSensitivity"]     = homingSensitivity;
+  doc["inactivityTimeout"]     = inactivityTimeout;
 
   // Serialize JSON to file
   if (serializeJson(doc, file) == 0) {
@@ -250,6 +253,9 @@ JsonDocument doc;
   if (!doc["homingSensitivity"].isNull()) {
     setHomingSensitivity(doc["homingSensitivity"]);
   }
+  if (!doc["inactivityTimeout"].isNull()) {
+    setInactivityTimeout(doc["inactivityTimeout"]);
+  }
 
   SS2K_LOG(CONFIG_LOG_TAG, "Config File Loaded: %s", configFILENAME);
   file.close();