When running the installer engine (via SCMU or PowerShell) we can assume it is Windows, and thus we can set the shutdown timeout to 2 minutes

Author: mauroservienti

src/ServiceControlInstaller.Engine/Configuration/ServiceControl/ServiceControlAppConfig.cs

@@ -32,6 +32,12 @@ protected override void UpdateSettings()
             settings.Set(ServiceControlSettings.EnableFullTextSearchOnBodies, details.EnableFullTextSearchOnBodies.ToString(), version);
             settings.Set(ServiceControlSettings.RemoteInstances, RemoteInstanceConverter.ToJson(details.RemoteInstances), version);
 
+            // Windows services allow a maximum of 125 seconds when stopping a service.
+            // When shutting down or restarting the OS we have no control over the
+            // shutdown timeout. This is by the installer engine that is run _only_ on
+            // Windows via SCMU or PowerShell
+            settings.Set(ServiceControlSettings.ShutdownTimeout, "00:02:00");
+
             // Retired settings
             settings.RemoveIfRetired(ServiceControlSettings.AuditQueue, version);
             settings.RemoveIfRetired(ServiceControlSettings.AuditLogQueue, version);

src/ServiceControlInstaller.Engine/Configuration/ServiceControl/SettingsList.cs

@@ -89,5 +89,11 @@ public static class ServiceControlSettings
             Name = "ServiceControl/EnableFullTextSearchOnBodies",
             SupportedFrom = new SemanticVersion(4, 17, 0)
         };
+
+        public static SettingInfo ShutdownTimeout = new()
+        {
+            Name = "ServiceControl/ShutdownTimeout",
+            SupportedFrom = new SemanticVersion(6, 4, 0)
+        };
     }
 }