On the box it states that it will have your nails dry to touch in 30 seconds and give you chip-free shine for up to 10 days.
As much as I would love to say it 'its fantastic and works like a charm!' I can't. It does only one of those things for me.
If your after a top coat that will have your nails touch dry fast this is great for that, so if you have a night out planned and want your nails done quick-smart use this. Though touch dry I wouldn't try doing something like the washing up straight after because you will end up with dents and smudges if your not careful.
Chip-free shine for 10 days however...not so much :(
You'll be safe for 1 day for sure..maybe 2. But I have found normally by day 2 its chipping slightly on my index and middle fingers, day 3 chipping more, day 4 I'm taking the polish off.
Recently I tried 2 coats of top coat and I found my nails were chip free for longer. 2-3 days. Day 5 they were looking ok, chipped but not horrid. So I change my verdict: Use 2 coats of insta-dri and your manicure will last longer than it would with one!