Lead.
This month
5 on 2 off, 6 on 3 off, 6 on 4 off. All working days. 17 days in a shorter month. In the summer it was similar but 19-20 days work. TASS or grey days as you call them evaporated with the shortage of 320 guys.
Generally three day tours made up of 3 sectors (hotel) day 2, 2 sectors (hotel) day 3, 3 sectors (home). Two day tours are 3 sectors day one and two. There are some long two sector day trips which tend to be senior and 4 sector days which tend to be junior.