I have a small school to quote for it has 103 windows in total. All different sizes none to big or alkward 90% on ground floor. Plus 12 internal doors. Inside out, very dirty.
Also a hotel. That has a combination of small and large windows. All leaded 71 ground, 46 1st floor, 33 2nd floor and finaly 19 doors mostly only half a door.
Once a month outside every other month inside.
Cheers!