The Roman architects and builders had to design the Colosseum to provide the biggest arena in the world capable of holding between 50,000 - 80,000 people. Just one series of games might last for 100 consecutive days. Attention had to paid towards crowd control. The Roman architects therefore devised an ingenious system of entrances, corridors, and staircases that allowed the crowds to enter and exit the Colosseum quickly and easily. There were 80 separate entrance arches - see Colosseum Entrances and Exits. By using so many separate entrances the architect solved the problem of crowd control - the Colosseum could be cleared in less than 10 minutes.