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Dooks-Fatberg
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.