I have some colored lights hanging in the window that have been there going on 2 years. I just LOVE the lights. At first I just wanted to see how long they would last. The ones I had on the tree outside were the regular lights...they lasted until July of last summer...the ones in the window are those LCD lights...2 years ~ 24 hours 7 days a week and still going strong. It pays to invest in some of those. Now its just a test to see how long they will stay on. and I love them..