How long should a clearaudio maestro v2 last?

Pretty sophisticated stylus profile on that cartridge, apparently the same as on the Goldfinger. 

I would think that, properly set up and playing clean vinyl, you should be able to get 1500-2000 hours out of that stylus. 

Look at the Soundsmith line for cost effective stylus replacement.

Here ya go!

https://www.gcaudio.com/tips-tricks/how-long-will-my-stylus-last/