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All dependes on how you drive the car.
How many WOT shifts it makes.
Stall convertor size.
How hot it gets.
Tire grip.
How many manual shifts.
ETC. ETC.
My guess would be anything over 350 RWHP a stock trans won't last.
(I broke my stock trans by manual shifting to 2nd with only 320 RWHP)
4D is right.. Heat is the big killer of these trannies.. They are pretty weak.. My 99 coupe went out at 43000 miles with 316rwhp and 322rwtq.. I always kept my DIC on the trans temperature.. You dont want to see over 210 degrees on it.. Really needs to be under 200 degrees