The standard waiting time before you begin wiping fresh grout with a damp sponge is typically between fifteen and thirty minutes, depending heavily on ambient room temperature, humidity, and the specific type of grout used. You must allow the grout mixture to set up and firm within the joint lines until it feels rubbery and firm to the light touch of a finger without leaving wet residue on your skin. Wiping too early before the grout has set can wash out pigment and erode the joint depth, whereas waiting too long causes the grout to harden excessively on the face of the tiles, creating a stubborn haze that requires harsh scrubbing to remove.
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