Turn over the Color Tower Liquid Timer and watch the liquids drop down into the lower portion. It takes approximately one minute (depending on room temperature) to completely empty into the lower portion. Great prop to keep on a science table for the children to tip, turn and watch as the liquid drips down. The Color Tower Timer can also be used for teacher or child stress/relaxation, quiet time toy, refocusing prop, anxiety prop, or a timer. The Color Tower Liquid Timer is 5 1/2" tall.