Everyone here probably uses it so often and cleans up so many different things with it that they go through it quickly even with adding water.. I have a smaller bottle that was not mixed with water but I had just found it in my car after being in there over a year it worked just as well as my new bottles. I think it can last a long time but because its such a versatile 1000 plus uses cleaner it wont be sitting around unused for that much time anyway!! PRODUCTS IN WALMART CANADA..YEAHHHHHH!!!