4-on-4-offWhat it means, in plain English

4-on-4-off is a shift pattern where staff work four consecutive days or nights, usually of 12 hours, then have four days off, repeating continuously. Four teams working the pattern provide 24/7 cover, with each person averaging about 42 hours per week over the cycle. It is common in manufacturing, security and logistics, and because the pattern ignores weekdays, days off fall on different days each cycle.