ASP.NET MVC应用程序运行多长时间

I wonder how long will an ASP.NET (MVC) application run, when no new requests come in? Lets say I'm using an IOC Container ans have a Singleton Object serving to the clients. As far as I know it will serve different page requests. But how long will it live when no new request come in? Is there any timeout (maybe configured through IIS) that says when my app will shut down?I wonder how long will an ASP.NET (MVC) applica