turbo 360 on engine dyno see inside!

How long do these motors survive at 6800 and full boost? I saw a Supra put down 1200 HP but there is no way I would stay into it at that screaming pitch! No turbo experience, but even hearing a N/A 340 at 6500 makes me want to shift something....I hope thats an R block, I dont think it would stay together at anything over 600 HP. Impressive.