If used only during spring and summer and taken inside in the winter, you can expect a basket to last 2-3 years. With that said, I have had some baskets last 5 years, but those were always under the cover of the porch and not directly setting in the elements whatsoever. If used year-round and setting out in the elements, you can expect them to last 1- 2 year max. After that the bottoms will tend to rot out and the wicker will become brittle. You can spray the basket will an outdoor sealer if you want to try to keep them longer - a good choice is Rust-oleum Varathane Sealer for Outdoor Wood. But really since they are so cheap and so abundant at the thrift stores, I normally just let them live their true life and buy new (thrift store) ones every few years.