[hinkley]

We had a build process that took half an hour, so people only ran it a couple times a day. I cut it to fifteen minutes, saving half an hour a day per person.

Then I cut it to 7 minutes, saving an additional 30+ minutes, because everyone was now running the build 4-5 times a day.

What I really saved was wasting each other’s time and goodwill by reducing the frequency and severity of people checking in broken code that blocked everyone else. Because they were expected to test more often, and they made smaller commits because it wasn’t so painful.