And he's not the only one...
How long would it take Ultimate Fighting Championship (UFC) interim featherweight champion Conor McGregor to knockout undefeated boxing kingpin Floyd Mayweather Jr.?
Depends.
While "Notorious" conceded defeat in the "sweet science," he also believes a "real fight" -- which I assume means mixed martial arts (MMA) or a (gulp) street fight -- would be over in mere seconds.
"In a real fight, I would dismantle him in seconds. Ronda [Rousey] would dismantle him in seconds, 100 percent. When you don't know how to grapple, you don't stand a chance.