If you work calendar monthly you will have the same amount due each month, let's say that's £3k for arguments sake.
So in a longer month you would end up having days off? And do 12 cleans a year but if you take holidays you might only do 11 cleans a year?
I work 4 weekly, which means 12 cleans a year and 4 weeks hols.
I count my 4 weekly cycle as my monthly earnings, so say I earn 750 a week I tell myself that's 3k a month as my bills come out every month, which means I get 4 weeks paid holiday a year
But in actual fact I work daily, I don't worry about days of the week etc.
For example if I have finished one weeks work in Thurs and none due till Monday I could have Friday off but sometimes I pull Mondays forward. And then if any rain delays or hols etc it might slip a week behind, but now I just have a daily target that I go out and do everyday as a minimum, so don't worry if my round is a bit behind or even pulled forward a couple of days.
Having said that I'm looking to get more structure next year as I've been I've been guilty of slacking off and coming home early last few months, I probably average 20 - 25 hours a week on the glass when I want to be doing 30