What could cause IIS logs with time-taken of 29641895 milliseconds

For few thousand requests in a log of more than 2 million records, IIS is recording time-taken as 29641895 or similar large num开发者_运维知识库bers. The time-taken value is in milliseconds, so when converted to hours, it translates to almost 8 hours. What could be causing such logs in IIS?

The logs being looked at are for a ASP.NET 4.0 web application hosted on a IIS 7+, Windows 2008 server. The application is developed on top of ASP.NET MVC 3 framework.

The logs are present for computed requests and for static requests also.

The ASP.NET MVC 3 doesn't apply the "executionTimeout" attribute in the web.config file. So you may suffer the long running log entry for that reason. Please check this post: Bug in MVC3 - requests never time out. Works fine for aspx pages in same project