How much spray?
Thanks
Seriously, this isn't a question that has a simple answer. If you do it right you might run a 300 shot for a long time with no trouble or you might burn a piston on a 150 shot.
I feel a 125 shot is really safe and 200 is fairly safe if done correctly.
Weakest link? Could be any of the above. More likely the pistons, rings, or head gaskets.

