In summer you could do sand the same day ( very hot sunny ) but I always book a return visit allowing 48 hrs to dry out, at this time of year the return is open ended and dependant on a couple of dry days.
If you use the widest head broom you can find (24" for me
) 200 sq meters takes me around an hour to hour and a half on me own ( depending on how hot it is, front or back )
Darran