Ultimate Fighting Championship - IGNguides . . . Times MMAC sanctioned events may feature a card that includes a single bout or tournament format.
Tournaments are single elimination.
Length of rounds and bouts are subject to the discretion of the promoter and match maker. Preliminary bout lengths will be approximately 15 minutes. Championship and Superfight bout lengths will be approximately 20 minutes. In addition, any competitor whose action interferes with the bout, such as attacking a fighter under the referee's protection, flagrant disregard of the referee's instructions or interference with the MMAC's officials' management of the event is prohibited. The referee will stop the bout after any foul.