Turn over the Swirly Fish Timer and watch the liquid drop down into the lower portion while turning the swirly fish wheels. It takes approximately one to two 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 drips down. Swirly Fish Timer can also be used for teacher or child stress/relaxation, quiet time toy, refocusing prop, anxiety prop, or a timer. The Swirly Fish Timer is 5 1/2" tall.