They last for as long as you keep your nail polish on and I had no problems taking them off. All I did was peel off my nail polish and the sticker came off with it.
If you would like to try these stickers out for yourself, click here.
I was given this nail sticker for free from bornprettystore.com. Every single character I type on this post is truthful, my own opinion, and I would not and will not lie to my readers.