Turn over the Double Ooze Timer and watch the liquids ooze to the lower portion. It takes approximately three to four 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. Double Ooze timer can also be used for teacher or child stress/relaxation, quiet time toy, refocusing prop, anxiety prop, or a timer. Double Ooze Timer is 5".