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4-on / 4-off usually works out as 2 day shifts followed by 2 night shifts. You then get 1 rest day and 3 days off. This means you get 2 weekends off in 8 weeks. Worked it for 2 years and hated every minute of it. Very repetitive, and when you throw in overtime tiring.
28 day pattern works like this:
Week 1 Start Monday work 2 days/2 nights.
Week 2 Start Wednesday work 2 days 3 nights.
Week 3 Start Friday work 3 days 2 nights.
Equal time at work/off. 14 shifts in 28 days.
Feels non-repetitve and is less tiring.
Having said that after 9.5 years on shift just about to start working 9-5 and I think I'm going to miss shifts.