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I work a strict rotation, 3 days on, 3 days off. 12 hours per day.
When I'm at work, it's about 5 hours per night. For example I've been at work on Sunday, and I'm at work for 8am this morning too. So even if I go to bed now I'll still only get 6 hours sleep. More likely, I'll not go to bed for another hour though.
On my days off though, I sleep until I can sleep no more. I normally get at least 9 or 10 hours per day then.