I'm a guy. Not into fancy nails. My best friend is a girl who is definitely into fancy nails. I also have 3D printing as a hobby, part of that being UV resin related. I have worked out that the UV light which I use to cure my models after printing, is the same wavelength as the acrylic setting UV lights. it doesn't even take 5 minutes for a large model to be cured all the way through, and that model doesn't need to be clear. The longest I've seen nails take is like 3 or 4 minutes. so where does 20 minutes garbage is coming from, I really don't understand? That's a fuckload of UV light, and would make the nails beyond brittle...