Most of the nickle cases that I have used either start harder or work harden faster and split much sooner than plain brass cases.
I don't carefully count the number of times that I reload my pistol cases so I'm not sure how quickly it happens. They just always seem to be the first to go.
I've reloaded a gazillion nickel handgun cases. Can't say I've noticed any difference from brass other than it's shinier.
While I haven't loaded anywhere near that with rifle, what I have loaded seems to last as long as brass cases.