Turn over the Swirly Fish Wheel Liquid Timer and watch the liquid turn the monkey wheels as it drops 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. Monkey Wheel/Ramp Timer can also be used for teacher or child stress/relaxation, quiet time toy, refocusing prop, anxiety prop or a timer. The Swirly Fish Liquid Timer is 5 1/2" tall.