If you are running the tests on a particularly slow CPU or slow network, you can increase the time limit by specifying a value in the time factor field. Each test's timeout limit is multiplied by the time factor value. For example, if you specify a value of "2", the timeout limit for tests with a 10 basic time limit becomes 20 minutes.
The maximum time factor value that can be set is 10.
Try running without a time factor first and increase the value as necessary.