I have worked 60+ hour weeks only one time in my life. Before I joined this company, two of the three employees separately contacted me to warn that the boss was, in their words, "crazy." Unfortunately, I didn't believe them. I hadn't had any experience with crazy bosses up until that point in my career. The only other employee quit around the same time.
I lasted four months. The pay was good. And the job would not have been that difficult. It didn't even require more people. But the organization had definitely completely broken down. Everyone did five different jobs, everything from electronics repair to customer service to data processing to moving equipment. This was by design, apparently, in order to make the company more "agile."
I spent a lot of time automating simple data processing tasks, and working on improving physical processes that took a lot of time for no real benefit. But I couldn't make improvements quickly enough. Almost the entire time, the "crazy" boss was literally looking over my shoulder, telling me how to do every little thing in whatever particular way he thought was best. Even though I had been a Unix consultant for nearly a decade, he took it as his personal mission to teach me the wonders of Excel as a universal programming tool. Ugh.
I was actually relieved to eventually be fired, after working two weeks straight, including travel and weekends and 10-11 hour days, simply for taking a day off. One of the other employees left at the same time. The last thing I did was to fix an absolutely crippling issue that I had noticed on the first day on the job, but never had the time to properly investigate. They had re-programmed a bunch of wireless routers with the same MAC address. Brilliant.
Last I heard, they had hired a dozen people shortly after I left. Probably all Excel experts.