report viewer timeout

Hello,

using ssrs 2008.

The ssrs report takes over 20 mins to populate. This works fine if it is run from the server i.e. http://reportserverName/reports/reportName...

In my winform I am using a report viewer control which calls the report. But in the report viewer if any report runs more than 10 mins then it shows timeout.

The report on the server has the option "Do not timeout report" selected

Question:

Is there a way to increase the timeout in the report viewer control?

Thanks