I've had the same one I picked up from a headshop well over a month ago. They can last, as long as stupid/stoned friends don't dump it out. If need be, just make sure you have an ash tray nearby to make finding it easier.

Its never showed any signs of cracking, and lets just say I've put the flame to it hard. It's perfect for my bong w/ ashcatcher. No one will dump that out. At least if they dont want to shower in bong water...