20 Minutes TimerDetails: Part puzzle and part functioning clock, the UGears 20 Minutes Timer is all fun when it comes time to assemble. With an estimated assembly time of about three to four hours, constructing this quality wood timer is the perfect way to spend an afternoon or evening. Engrossing as a solo model build project or entertaining and educational as a family activity, the UGears timer entrances. Number of parts: 107 Recommended Age: 14+