For a 300-square-foot area, the cleaning process typically requires between 1 and 3 hours. If you decide to seal the grout with a urethane finish, we suggest waiting for 24 hours after washing to apply a sealer to ensure that the sealer is able to adhere correctly. The process of sealing grout takes approximately two up to 3 hours. It varies according to the size of tile, amount of soil present in the grout, and the room’s configuration.