The competitors started at Sunday at 9 a.m. and are still going.
The Phoenix Suns are hosting a contest that started with 45 people bouncing their way towards a free trip to an away game with the team.
Contestants must dribble continuously but are given a five-minute break every two hours. Only four remained as of 9:30 p.m., over 36 hours after the contest began.
Watch the challenge live HERE