I had worked once from 8AM to 10PM. It was long and tough day. And it was really difficult to get up and go to work next day.
And for one month I had 10 shifts. From 7AM to 7PM. It was really difficult, because it was hard physical work. After work I had almost no free time and only wanted to rest after coming back home. I left this job soon because money that I got wasn't worth all efforts.