Section 14.10 - Duration of Round(1) A round of unarmed combat, other than the final round, includes a period of unarmed combat followed by a period of rest. The final round of unarmed combat includes only a period of unarmed combat.(2) For boxing and amateur mixed martial arts contests or exhibitions, a period of unarmed combat must be three minutes in duration, and a period of rest following a period of unarmed combat must be one minute in duration. The Commission may approve a different duration for either period.(3) For professional mixed martial arts contests or exhibitions, a period of unarmed combat must be five minutes in duration, and a period of rest following a period of unarmed combat must be one minute in duration. The Commission may approve a different duration for either period.(4) A round of unarmed combat does not begin or end until the bell, gong, airhorn or other audible device approved by the Commission sounds.Amended by Mass Register Issue 1331, eff. 1/27/2017.