The reason I'm using the tape is I have single eyelids and I want to get double eyelids. The first couple days of using the tape, I wasn't really sure where my line is. It didn't last even 3 hours (wrong way, wrong result). However, later I discover one of my eye's line is perfect and last almost whole day (it was an awkward day, because I have one single eyelid eye and one double eyelids). So, that night I used the line on the "perfect" eye, and copied the same line to the other eye. The result is fantastic. This is the 15th day of using it. I just reorder another 28-days tapes.