Thanks to everyone who replied. I thought about this when I was at Costco earlier this week. There's a lot of different categories of products available, including packaged and fresh food, clothing, prescription and non-prescription drugs, and electronics. One thing I didn't see were a lot of home repair tools or supplies. I think for a while you could ignore small repair jobs, but eventually you're going to need to fix things. So, my response would be around six months.