The folks who "worked for me" were "nonexempt", so I had to understand the "rules" that mattered, to me. I had to preauthorize OT, which was a pain. I avoided that.
I was on one project for several years where we were doing a lot of a specific kind of analyses that took about 3 hours per run. We had three machines so I'd come in on weekends and get them running to speed things up. The guy who took my spot didn't understand the techique or care to, so he put the machines in storage. They ran about $100 K each. I'm sure they got tossed. They measured several key parameters of the material we were developing, he didn't care.