How long does the Weber gas cartridge last? The Weber gas cartridges last approximately 1,5 - 2 hours. Related articles Can I connect a large gas bottle to my Q1000/Q1200/Go-Anywhere/Performer Deluxe? How long will a 1lb LP tank last? What gas do I use for my Gas Go Anywhere? How much charcoal or briquettes should I use in my charcoal barbecue? Is there a Weber with methane gas?