I have no plan on ever keeping make up on for 24 hours but about 9-10 hours is average for me during that time this eye liner stays put with no smudging, no fading and no transferring to the top of my eyelid.
The eye liner is very black and taking only one swipe for full black opacity, the tip is very fine so if you use a light hand a thin line can be achieved easily, but it can be easily used to create a thicker bolder line. The liner is very easy to apply and doesn't drag my eyelid which I noticed a few other brands did.
For £2.99 this is amazing and I really wish I brought it earlier, it beats so many more expensive ones I have tried.
Overall I really love the collection 24 hour felt tip eye liner and I will definitely but it again when it runs out.
Have you tried this yet? do you like using the felt tip eye liners?