Usually the pattern is 4 days ON/ 1-2 days OFF (at least 36 hrs). What it means on a 11 days OFF contract is 11+5-6 days off per month. Also when choose the resident option is the same than commuting. nothing change
So I understand the 36 hours off after 4 days on are always spent at your base city? Even in commuting contract?
About the 8 and 11 consecutive days off per month that is only a commuting roster benefit. I asked at Hainan.