They'll last as long as they're in good condition = indefinitely.
You can also use this (avail @ Petsmart):
Use search for Kitty Litter Humidity. Best of luck.
Speaking of Top Gear... Looking forward to another great season!
Top Gear Filming with not one but THREE Bugatti Veyron loaners in the UAE Quote: ABU DHABI - Psst, buddy, can you spare me a sports car? Yes, evidently, three of them. This weekend...
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