A little goes a very long way. Can't say how many days, depends on if you put it in spots or use on whole face/neck. It works well. I used just a tiny amount for under my eyes which were puffy from barley any sleep (newborn baby need I say more? Lol) and it's lasted me over a week. A little goes a long long way.
Oh yeah, it says depending on individual use. like I said all depends on how much you use. But if your looking for something that works the target areas it says (wrinkles, etc) then this works great!