Time limitation for selenium tests in TestComplete?

Hi there,

I've configured to run selenium test suite (python script) in TestComplete. At first everything went well, but after adding more and more tests into the suite, i'm encounting a strange issue and still have no idea what's going on:

When selenium tests run more than 1 hour, selenium tests will terminate all of a suddent.

I could not get any useful message from python or TestComplete part. I'm wondering if there is a place in TestComplete to control running time for selenium tests?

NOTE: Timeout value for selenium test item is set to 0 

Thanks,

Ocean