I work in the film industry, where each show might run 4 or 5 months, and then we're unemployed and have to look for the next gig. The job hires the main crew, and then hires dayplayers on days needing extra hands. But a dayplayer is very flexible and can choose what gigs to work on and for how long.
It's expected that everyone works the whole show. Sometimes I get burnt out on a show, working a minimum of 12 hours a day, sometimes working all night. So if I've had enough and don't want to work anymore, I get really weird looks. The bosses are baffled that I don't want to complete the show. But there's plenty of help, we're all easily replaceable. But when I tell the bosses I'm burnt out, or don't want to keep working these stupid hours, it's like they can't believe it. I see it as a toxic work environment. The only “acceptable” reason for leaving is if you have another big show that starts at the end of your first show.
Even if a show gets finished, it's common to be expected to work with the same crew on another show. One particular boss was basically counting me on joining their next gig. Saying “I just don't want to work for awhile” is seen as crazy to most workers I know. Luckily, I had genuine health concerns and needed to make several doctor appointments, so that was seen as an “acceptable” excuse.
It's just a toxic, demanding industry.