Wait, so how well did it work?
I don't remember any big insights except that I'm pretty bad at estimates.
Everything that feels like a "half-day" task took an entire day or two. I would look back on every feature and think, "No way was I working on that for X days straight?"
Basically nothing takes less than half a day.
I figured if it works for software profiling it oughta work for people. And I set the interval to some Golden Ratio thing like 37 minutes, with the hopes that it wouldn't log the same times every day, but also wouldn't be purely random.