We empirically have on average 70 builds a day. The number is higher than your calculation because we don't all work 9-5, we're commiting frequently from around 8am to 9pm. We also run builds repeatedly overnight to flush out any intermittently failing tests we may have recently introduced. We'll run the builds as fast as they can go from 2am-4am.
So how often does a commit get checked in that causes a test (or tests) to fail?
It just seemed to me like you were bragging that tests get run over and over again. They only need to get run if any new code is committed, of course.
And what kind of commit is being checked in every 9 minutes? How big is the dev team? Seems like an awful lot of commits. Is each one a full-fledged feature / bug fix for the site, or are many 1-line changes to the code?
