What is a typical life span of a stylus or cartrid

I have opt to make a purchase on a turntable that has roughly 30 hours of use on the table and cartridge.
A hifi shop has it and offered me $70.00 off regular price.
Any ideas?

Thanks

By the way, I am just getting back into vinyl. I am a borderline audiophile if you want to call me that lol.
Another words I have been into Hi end equipment for 20 years. Just budget minded till now.