I've been going 18 months now so perhaps still a little inexperienced but I've got a van & delivery system.
What I can't fathom is how anyone can do 25 houses in a day. Perhaps if they were all lined up in a row but that's a round that's gonna take some getting. On top of which, I'd be knackered.
I'm lucky prices are decent (I think) where I am. £15 upwards 2 bed semi, that sort of thing.
I'm happy if I can clear £200-£250 a day (with the variety of size houses that doesn't need to be 10 @ £20 etc) - 8:30/9:00 ish start (once dog walked & kids in school) till around 4.
I appreciate there are ups and downs in the year in terms of ability to work/unexpected costs but that figure keeps me under the 40% bracket.
If I did 25 houses a day I'd be well above (well, when the book is full).
The local window cleaning company where I live have a quota of 43 houses per day. All ladder work though. On some runs people have done the 43 for half 11 or 12. Then they can either go home or work on bonus, where they get half the value of anymore work that they do that day. Depending on which part of the run it is, I've seen people do 86 houses by thereself in a day.