If you want to leave at a consistent time, one technique is to make a fixed-time...

tedmiston on March 30, 2017 | parent | context | favorite | on: Ask HN: How do you avoid staying too late at work?

If you want to leave at a consistent time, one technique is to make a fixed-time commitment after work, eg, schedule the gym from 6-6:30 M-F. Then stick to this consistently and make it clear to those you work with.