Theres not 10 hours of daylight this time of year within in reasonable time restraints, i.e. it might be light before 8am but you wont be cleaning residential before that. Too dark after 4.30 at the very latest. Half an hour off for lunch, fAg, poo, pi$$, changing any blades that need changing, talking to custys when they pay, crossing the road, bla bla, that works out at a house every 7mins and 51 secs by my reckoning, a window every 53 seconds non-stop, every minute your working.