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This is a quote from Bal's guide for tile on anhydride screedI thought you were looking for a minimum 75% rh for tile and i have a feeling that somebody who should know ( i think it might of been @Ajax123 ) said there was no evidence to support that by removing latence you decreased drying times
Laitance is a weak layer of fine particles deposited on the surface of the screed as the anhydrite cures. This layer is too weak to tile onto and can also inhibit drying of the screed. Many of the failures we see are as a result of contamination of the https://www.tilersforums.com/forums/tile-adhesive/ by laitance – highlighting the importance of carrying out this step.
They do also state 75% relative humidity, but Fball say it ok at 85% using their product.