Depends on what you're referring to with overtime. If it means 24/7 rotating shifts to compensate for the unpredictable, yes, that absolutely happens. So it's n

Depends on what you're referring to with overtime. If it means 24/7 rotating shifts to compensate for the unpredictable, yes, that absolutely happens. So it's not so much "overtime", is "off-hour shifts". Again, this started as an "skyscrapers sites" analogy. If you have a guy working in such construction for 20 hours straight, you're calling for a (very possibly fatal or catastrophic) accident, and there's absolutely no insurance company that'll cover for that, among other problems you'll be calling for.