Not enough information, and I'm not quite sure what "average peak" means.
All that can be said at this point is if you had 60dB crest factor you'd need 1,000,000 times average power to cover the peak power requirement.
FWIW, information I found suggests there is 24.6dB crest factor in the 1812 Overture, but it's not clear for what source. So, what ever power is required to produce the average level you want, multiply it by 436.5 to cover the peak demand for that example.