Park skis generally last me a seaon but I park a lot. I've had my AR7's for a little over a year and the only damage they're got is two cracked edges underfoot from rails and some chips in the top sheet as well as as some base scrapes. Still got quite a bit of life left in them.
I ski in a snowdome so I constantly ski rails. I ski two - three times a week probably around 40 weeks a year (the other couple weeks of the year I go and ski an actual mountain). And I ski at least 3 hours each visit so I've probably spend at least 80 day skiing in a Snowdome, 80*3 hours = 240 hours then probably another 100+ hours skiing at mountains. So my AR7's have lasted around 340 hours (probably more).