how long should thinset dry before tiling
24 to 48 Hours. You should wait at least 24 hours before grouting the tiles. You may notice that the edges of the thinset or the thinset showing through the grout lines looks dry. Don't be fooled by this.The thinset under the tiles isn't receiving as much air as the edges and is therefor not fully cured.ven if you take care not to disturb the tiles while grouting before the thinset has cured, you would be sealing it off from the air it needs to cure. To maintain its adhering properties, the thinset needs to dry completely.