Ref days off, some companies roster:
2 DAYS, 2 NIGHTS, REST AFTER LAST NIGHT, 4 OFF
2 DAYS 3 NIGHTS, REST AFTER LAST NIGHT, 3 OFF
3 DAYS 2 NIGHTS, REST AFTER LAST NIGHT, 4 OFF
Ho hum.
I find this pattern works well as it seems like "time on/time off"...