Stays all day.
I love these eyeliners! I have them in so many different colors and use them constantly. They go on very smoothly and are creamy and very highly pigmented. I usually apply my regular eyeshadow on the lid and crease, then apply this liner and "set it" with a smoky layer of a similarly colored shadow. When I do this, it stays on for hours and I've never had trouble with it smudging. They only reason I gave this a 4.5 instead of a 5 is that I have to sharpen my pencils pretty often to get a fine point. I love all the shades but the ones I use most often are Electric, Zero, Covet and Ransom.
I love this eyeliner!! Electric was the first color I tried and I loved it. It glides on, its really smooth, last so long and it doesn't smudge. I use it in my waterline and never had any irritation or made my eyes water or anything like that. At the end of the day look as if I just put it on, and I have never had to touch up.
It stays put! Once the liner is applied and allowed to set it will not budge. I love that about this pencil. So many products like this claims to be water-resistant and smudge-proof but truth is that there is nothing like UD's 25/7 Glide-on Eye Pencil. Don't believe me...try it for yourself...