I counted them up a while ago, somewhere around the 170 mark I think.
Typically 200 would be the max, and then you can work on getting 100 only.
This business isn't quite as black and white as that though Ewan.
In all honesty, there are too many variables, nationally and locally, to think that this is the norm whoever and wherever you are.
It would also depend on your own circumstances, work ethic, motivation bla bla.
Most businesses cannot be run by an equation, including window cleaning.