add ability to configure scheduled task time limit

MediaBrowser.Model/Tasks/TaskTriggerInfo.cs

@@ -36,5 +36,11 @@ namespace MediaBrowser.Model.Tasks
         /// </summary>
         /// <value>The day of week.</value>
         public DayOfWeek? DayOfWeek { get; set; }
+
+        /// <summary>
+        /// Gets or sets the maximum runtime ms.
+        /// </summary>
+        /// <value>The maximum runtime ms.</value>
+        public int? MaxRuntimeMs { get; set; }
     }
 }