If you are running the tests on a particularly slow CPU or slow network, you can increase the time limit by specifying a floating point 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 "2.0", the timeout limit for tests with a 10 minute limit becomes 20 minutes. A value of "0.5" for tests with a 10 minute limit produces a 5 minute timeout limit.
Try running without a time factor first and increase the value as necessary.