In the 27 years since my graduation, I've worked both 8 and 12 hour shifts. The first hospital job I had was 3-11. I was single and childless and it was great for my body. At that time, my friends all worked pm's too, so we'd all get together after work if we wanted and party til 3 then go home to bed and get up just in time to get ready for work. Since then, I've mostly worked 12 hour night shifts. For a long time when I was younger, my favorite was to do 3 on 2 off 3 on six off. But now I not only can't do 3 12 hour shifts in a row anymore, I was having more trouble with 12's. Not nearly enough sleep. Tired all the time which made me more susceptible to illness. I left a job I love to be able to go back to 8 hour shifts. We'll see if I end up liking this job as well when I've been there longer. I do love how quick the shifts seem to go by though.