adjusted update staggering

MediaBrowser.Common.Implementations/Updates/InstallationManager.cs

@@ -172,7 +172,7 @@ namespace MediaBrowser.Common.Implementations.Updates
             {
                 // Let dev users get results more often for testing purposes
                 var cacheLength = _config.CommonConfiguration.SystemUpdateLevel == PackageVersionClass.Dev
-                                      ? TimeSpan.FromMinutes(10)
+                                      ? TimeSpan.FromHours(1)
                                       : TimeSpan.FromHours(12);
 
                 if ((DateTime.UtcNow - _lastPackageListResult.Item2) < cacheLength)