The timer ends after this dialogue at 4:47 is over, provided that every boss (including the Dire) have been killed.

It doesn’t matter if I one shot the Beast Titan, the dialogue is still there. The dialogue reads “The Garrison Regiment Battalion and the Military Police Regiment Battalion have arrived!”

It felt great breaking the previous WR, which has been standing unbroken for over 2 years! I think, that this is the ideal time for a quartet.

Maybe it's possible to shorten this record by 2 seconds, but it remains to be seen.