Started on the padres house at 8.30 full of good intentions. stopped at 8.35 as water freezing on windows! That was using a trad pole to first floor. Went back when the sun came out and finished it.
I've found if its much below -4 then it just dosent work, water freezes, wiping cloth and squeegee blade go hard etc.
Later on I did a massive house for the first time, the new occupiers brought me with them.
Wanting to get the pricing right I called at the house next door and asked her how much her window cleaner charged her. ' I havent got one she replied but I had a quote' ended up with both houses at £40 each, nice last job on a friday.