Turn over the Monkey Wheel & Ramp Liquid Timer and watch the liquid turn the wheels or slide down the ramp 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 Monkey Wheel/Ramp Timer is 5 1/2" tall.