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When I was doing regular milk runs (Med - Caribbean) on race yachts for regattas either side of the pond the best system I found was 4/4/4/4/3/3/3 which gave us an extra hour of sleep every second day.
Admittedly there's a shitload more work to be done on a 70-100ft yacht than a container ship, but as long as the crew is fit and the food is well prepped, no dramas.
My old man did the round the world race and he said they did 6/6 all the way around the planet. Faaaaaark that.
Pic related about 2k NM out of the Azores.