I was probably at least a month before I confidently noticed results and I feel like if you stop using it (say you run out) it doesnt disappear overnight but does about the equal amount of time it takes to get to a point to see results (like after stopping use one month later my lashes looked lacking)

Havent received the product yet, but hoping to see the result. My friend said it is good. 

This serum is worth it to buy. It hold eyelashes curl for long time and it make eyelashes grown longer than before