I usually keep about 100 lbs of soap base around, unless it's the holidays. Then I keep about 200 lbs on hand for special orders, last minute orders etc. I think it depends on what type of base(s) you use, where your supplier is located (I can usually get mine in 1-2 days), and how much business you generate. I've never had soap base sit for too long but I don't believe it goes bad. It's kind of like wax, I suppose.