Yeah, this reminds me a lot of the "Impossibly Hungry Judges" problem[0].
...this has potential!
Scrape GitHub, find closed issues marked 'bug', do a blame on the offending line or lines, find the timestamp and plot.
The hypothesis I would personally register is that bugs increase after 5:30 PM, and that this effect drops off in late evening hours.
Basically, that compelling one's employees to stay late is an anti-pattern, where one loses more than one gains.
Edit: This allows the law officials to remove offenders faster from the courtroom.