Literally! The first time I used this liner, I took a shower that evening thinking that I would remove whatever eye makeup was left after I'd washed my face. I got out of the shower, and the eyeliner hadn't so much as smudged! I went to bed thinking I'd wake up with the typical raccoon eyes, but it stayed put then, too. I've found that even with washing my face, I can get two full days with at most just a little touch-up.
I've tried many different liners, and this is hands-down the best for staying power. It's pretty thick, so it can be tricky to apply thin lines with, but once you have the hang of it you'll have beautiful cat-eyes that last through your weekend.
This liner goes on smoothly and cleanly, but I found it more difficult to draw a straight line than with my gel liner pot and brush, so I returned it. I wanted to try this type of liner because I was looking for that shiny black color, but the color was pretty much the same as my pot. I'm not an expert when it comes to applying on liner, so I'm sure others would find it easy to apply, but I needed something that would be less time consuming. I was able to get it off with my Neutrogena makeup remover wipes easily so not sure why others were saying it's really difficult to come off because I had no problems.