Obviously one can have a ton of trivial tests that run in very little time. That doesn't demonstrate a lack of bias. The bias was not contemplating the possibility that an extensive test suite could take much more than 20 minutes to run. In my experience, extensive test suites on a company-wide scale usually take quite a bit more than 20 minutes to run, so I don't consider such to be an 'outlier' as characterized by Ovid to dismiss the criticism. But I'd not have set the upper limit on number of tests at 10,000 either. I'm sure we each have over 100,000 tests at my current and previous employer.