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Is that a thing?
I'm assuming your Builder is using a cheap cementitious grout.
If 'Yes' the drying/curing time is not dependent upon the surface area, but the thickness of the applied layer, and the time it will take for the excess mositure/water to escape from the ever densifying mass of screed.
Cementitious systems need more water for placement/ to give sufficient liquidity to allow flow than they need for the hydration reaction of the cement. This excess mositure has to be allowed to escape, or it will 'blow' whatever surface you put on top of the screed.
Bear in mind the current temperatures and the humidity outside, I'm surprised their willing to commit to a just a week.
mespilus
Dooks-Fatberg
Quick q: we're having the unused downstairs shower room taken out to make a more usable utility room. When they took up the shower tray the concrete floor came with it leaving a hole about... well about the size of a shower tray. maybe 1.5m sq? They're going to patch it up but have warned that that new screed needs a week of drying before they can tile over it. I'd get it if it were a whole new floor, but a 1.5m sq patch? Is that a thing?
PS i realise that referring to "an unused downstairs shower room" could lead directly to the golf club thread but it's nothing to brag about. The house had previously been converted into two flats, then recombined but they left the downstairs shower room they'd built into a shonky blockwork extension off the basement kitchen. We've lived here 5 years now and no-one has ever used the shower which just gets piled up with laundry, pushchairs and other junk that won't fit under the stairs.