The execution time-out is the number of seconds an ASP.NET page is given to execute before the operation is assumed to have failed and therefore terminated. This could occur for example, if you are running large reports and the code that processes the report times out before the report has completed.

The default execution timeout value is 90 seconds; the System Administrator can change this setting by inserting the httpRuntime tag and setting the desired number of seconds in the executionTimeout property in the web.config file, usually:

In the example below, the timeout is set to 3600 seconds (or one hour):