I had a breakdown on my pump (100psi) and I have been using a 60psi pump for the last couple of months.
I have a large office suite, two floor, to clean, on a two monthly visit and the last time I cleaned it was with the less powerful pump. It took four hours, which is still good, as it is priced right.
I have cleaned it several times previous but just could not remember how long it has taken previously.
2.5 hours this morning!!! I don't think I need to say anything else!!!
Rob