It’s not up to me what you charge I would lose on that job at that price,I price those jobs like they won’t last there’s hardly ever face to face relationships with the customer I never price per hour I price per job and what I think it’s worth.
If a customer says to me how longs it going to take I would say what difference does that matter 20 minutes it’s still 50 quid,an hour and a half still 50 quid. If a customer said to me how long will it take to clean I’d walk anyway lol no one wants customers like that.
I look at those as bonus money bread and butter domestics that get the odd small roof cleaned for free I’d look after,flats or offices have the loyalty of a cat.