At what point do you believe your maintenance individuals have worked beyond a safe number of hours? 15, 20? I had a mech that was working for over 20 hours yesterday. The guy was really getting things done, but I know you can't run a guy all the time like that, it's not safe or healthy.

Especially when they are distracted in any way.  Phone calls ( when is the a/c gonna be ready etc )  It is dangerous to have a wrench work that long.   But they have their pride too.

on site.  Use the rules pilots at the most.  Maintenance can be a very very tiring activity.

You are a liability to everybody in this industry. Even 14 hours should mot be everyday.

Didn't mean that 14 each day.  What maintenance people should do is point to state and Federal labor laws, plus, ramp up how overwork and subsequent mistakes are a liability the company cannot reasonably escape.

Could be a continuation subject for alphabets like HAI.

Wrench bender here. 8hrs of nonstop troubleshooting and I'm done. 12hrs of easy stuff I've done 100 times and its not 90 degrees out? I'm going home tired but I feel pretty comfortable everything will be done correctly. Working 20hrs is just insane. No amount of pride offsets sleep deprivation. 

doing 20 hours puts you in sleep deprivation and can put a MAINT tech at risk of liability suits if some part of the work leads to harm.  Companies do not have the right to push employees beyond reasonable limits.