Turn over the Smiley Quad Timer and watch the liquids drop down into the lower portion while turning the smiley face wheels. It takes approximately two to three minutes (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 turns the wheel. Smiley Quad timer can also be used for teacher or child stress/relaxation, quiet time toy, refocusing prop, anxiety prop, or a timer. Smiley Quad Timer is 5 1/2" tall.