Does it happen with anyone else - you try to fix one small bug Friday evening before leaving work and the next thing you know you are still at work at 9pm?!
If it's just me, I really need a life :(

Bugfix branch. 30 minutes or delete it and try again Monday.

Wife and kids I'm happy to go see.

If it's taking that long in one go, sleep on it

I used to bring a sleeping bag to work back in the day. I found staying up so late and only getting a few hours of R&R led only to exhaustion and really crappy code/problem solving. Let your brain rest. Your subconscious mind works on problems during rest and sleep and the solutions come to you in the next work cycle.

I try to keep Friday afternoon/evenings for status updates and client meetings...
Helps me plan for next week and most of the time client is in hurry to leave early so we end up wrapping up early...