How Long Does It Take for Grout to Set?

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Grout must set for 15 to 30 minutes before it is wiped for the first time and another 3 hours before it is wiped a second time, according to In both stages, the grout should be wiped with a wet sponge to remove excess grout on the tile.

The grout must be allowed to dry for several hours or overnight after the wet wipe. Once the grout is dry, a haze forms on the tile. The haze should be rubbed loose with a dry towel, and then the remaining dust must be swept off. Using a wet towel for the last step often causes the haze to form again.