If the mixture gets too hard and is too difficult to scoop, place the pot back over a warm burner and stir to loosen. If necessary, you can add 1 tablespoon of hot water and stir to loosen as well. Depending on how cool your room temperature is, this could take anywhere from 1 to 5 hours to set up. If the room temperature is too warm, you can set the chocolate in the refrigerator.