hi mate, put every one on a 6 week cycle, that way it is just longer enough so that they dont moan
number your days 1 - 30 so every week is 5 days and you have 6 of them, start at day 1 and then day 2 and so on, tehn if custy want it done every 2 weeks but them on day 1 day 11 day 21, that way it will be every 2 weeks, what u will find is that not all days will fill up so if you lose a week you still have 5 weeks to play with and move jobs around, i do this and find it easier