This month's CVG 767 F/O bid had 63 lines, 30 hard lines (as if that means anything here) and 33 reserve lines. Seven of the hard lines were 30 day and 7 of the reserve lines were 60 day. Some of the reserve lines were 15 days straight, some were broken 7days on, 15 off and 8 on, some were 5 off, 8 on, 6 off, 7 on and 2 off. And there were other combos. Some of the hard lines were 16 days on. One of the hard lines had 3 on, 5 off, 3 on, 9 off and 10 on. It's literally all over the calendar. Almost any combination is possible as long as there are 5 days off between working days. And since they are "Z" days that could be 3 US time zone real days.