Clarify duration string

Author: ardatan

packages/web/docs/src/content/router/configuration/traffic_shaping.mdx

@@ -35,8 +35,9 @@ requests.
 - **Type:** `string`
 - **Default:** `50s`
 
-Controls the timeout (in seconds) for idle keep-alive connections in the router's connection pool.
-Connections that are unused for this duration will be closed.
+Controls the timeout in duration string format (e.g. `1m` for 1 minute, `30s` for 30 seconds) for
+idle keep-alive connections in the router's connection pool. Connections that are unused for this
+duration will be closed.
 
 ## Example
 

packages/web/docs/src/content/router/guides/performance-tuning.mdx

@@ -59,6 +59,9 @@ connection pool before being closed.
 
 - **Default Value:** `50s`
 
+It takes a duration string (like `30s` for 30 seconds, or `1m` for 1 minute). This setting affects
+how aggressively the router reuses existing connections versus closing them to free up resources.
+
 ### The Connection Reuse Trade-off
 
 **Too short = latency overhead:**