You can get 'quick drying' tile adhesive (3 to 4 hours till set). This is
usually used by 'professionals', it is more expensive than normal stuff, but
allows them to tile and grout in the same day, therefore moving onto the
next job tomorrow and make more money.

The usual charge up here (West Yorks) is £20 per sq yard to fix and grout,
so if you have 15 sq yards then that is £300 for the job (i.e. per day). If
they have to grout tomorrow then that is £150 per day, if two men (normally)
then that is £75 each per day instead of £150. Hope that makes sense, it
does to me but then again I wrote it!

John