This stress will be tensile during temperature decrease, or compressive. during temperature increase. If the compressive stress level exceeds the column buckling resistance of. the restrained length, then lateral buckling (or snaking) will occur.
Dry Time. In most cases, you should allow the grout to dry overnight before using that room as total dry time may take up to 24 hours. If you are thinking about sealing your grout after you have installed it, you need to wait even longer than that so that all of the moisture has had time to be released.
You should give it 24 hours to dry before applying tile grout, same on both walls and floor tiles, dont leave it longer than a week to grout and dont grout within 12 hours because the tile adhesive has to dry, so i would say tile and then grout the day after, giving atleast 12 hours minimum drying time, but technically do it after 24 hours.