well Luffy answered his own question "How long will it take SIN guards to take me down?"

He just had to test it out for himself I guess

yeah I mean look he leads by experience. He doesn't like to take information at face value

you gotta test it

see now he knows, and knowledge is real power. or something

exactly! and now he can do it AGAIN and see if he can break his record!

oh, Luffy.