yes, time that it takes is irrelevant, if... done correctly without fault,
one the otherhand, one of my tilers, asked for a job on price... foolishly I agreed, he tiled 17 on the wall on 6 on the floor, grouted in a bathroom in one day, from 7.30am - 10pm ! metro 300x100 halfbond wall, 600x300 rectified halfbond on floor... !
they wanted to go to bed ! the next day they looked at everything, picking up slightly recessed grout in places, mitred trim not meeting perfectly etc,etc....
if he had taken 2 days to complete, I am sure that they would not have snagged the work, as it was passable, not perfect, but passable and maybe just a quick re visit..
they stated ' working from 7.30 - 10pm, he must have been tired, why did he work this late '
so in essence, if you can tile large meterage and they are happy with the end result.. all good 🙂 but if it looks a lot for one day, they will scrutinize