Headcanon.com
Choppa said from 30 min there is only 10 min left ( 9 to 6 min ) .
So at best :
24 min
And we have :
24 min = what happened before Hakai + Hakai event + post Hakai + Luffy fighting Kaido .
Yeah Luffy didn't fight + 20 min
The japanese words said this :
In japanese It means a number of 10 min ( 10 min and above )
A- Choppa words :
1- 30 min only less than 10 min left .
2- Less than 10 min = 9 to 6 min or he would have said less than 5 min
1 + 2 = 24 min
B- Choppa started fighting before Hakai with MP heck even before we saw the supernovas complaining about Kaido and big mom which is considered btw an off screen and we get only the result .
C- Japanese words said :
A number of 10 min
• 11 min and above but in english they used dozen.
A+B+C = Luffy didn't fight for +20 min