As an engine tech for a diesel truck service center, I can seriously sympathize with where young chinese people are coming from. excessive overtime,
even paid, can turn you into a miserable zombie pretty fast.
somewhat quickly after my apprenticeship I was gifted quite a bit of nonsense overtime from the old timers. rotor turns, oil changes, timing, valve clearance, etc... were all heaped up on me until I was spending nearly 70 hours a week in a shop that advertised working hours of about 8 hours a day. My paycheck was more than enough to buy a new motorcycle, but social events like going out to dinner or seeing a ball game were out of the question. I was exhausted by the time I finished, despite the fact that most of my work used air tools. I could only keep it up for about a month before i started to seriously burn out. I found out managers despised having to cut huge overtime checks but found hiring a new tech too time consuming and costly in terms of training and certification. Whats worse is sometime around the thanksgiving holiday I walked into the shop with nearly 30 brake services to do in a single day because the front office had made promises to customers that I would be available without checking to see that I had a major engine service that would take up most of the day.
Young guns might want overtime, but management can get addicted to it and its not a problem until you're knee deep in paperwork and turning customers away.