Thread:Spinosaurus75DinosaurFan/@comment-40081978-20200207021032/@comment-27570307-20200207131635

I counted around 8 seconds.

Assuming omnidirectional expansion:

0.25*(pi*20000^2*8000*1.003)*(20000/8)^2 = 1.575508715775281309e19 Joules, Large Mountain level+