A schedule I am familiar with is:
3-12 hr days (Sat, Sun, Mon)
3 days off (Tues, Wed, Thur)
4-12 hr nights (Fri, Sat, Sun, Mon)
7 days off (Tues, Wed, Thur, Fri, Sat, Sun, Mon)
3-12 hr nights (Tues, Wed, Thur)
4 days off (Fri, Sat, Sun, Mon)
4-12 hr days (Tues, Wed, Thur, Fri)
2 days off (Sat, Sun)
4-8 hr days (Training) (Mon, Tues, Wed, Thurs)
1 day off (Fri)
Start over