Not an easy one to answer, but say it was going to be a daily driver for a year....

 

alot! i'm just kidding i have know idea but there are people on here running 11's with a 10 bolt, so i'd guess more than that.

 

The guy who runs www.9bolt.com has a healthy BBC in front of his. Here's a link, '88 Camaro with a 427 BBC and a 9-bolt.

 

Supposedly, it’s somewhere in the same range as a dana 44… what that survives depends on how hard you’re on it doing whatever you do.

I found that with 10 bolts usually the gears break (I’ve broken 6 sets), and occasionally, axles (broke one 28 spline). With 9 bolts the posi is the first to go, but it is rebuild able (I was killing them every 35 passes at the dragstrip on average) but eventually, I corkscrewed both axles causing some very funky bending action in the rear:
Watch the end of the axle/brake rotor vs the center section

 

FWIW, of the 10 bolt stuff one of the sets of gears was in my crossfire car that ran high 13’s, the rest and the broken axle were in my ’97 WS6, 6 speed, some during 13s NA passes and one set of gears and the axle during an 11s N2O pass. All the 9 bolt breakage was in a stockish, formula 350

 

For what you have listed in your signature and to be used as a daily driver what are you worried about??? Unless you do something dumb or studpid it will last. It will take more HP/TQ then you might make with a stock 350.