I recently tested the IBD Intense Seal and while it does take 90 seconds for a full cure, it will cure under LED.
Under UV it was a 3 minute cure, so it's still faster. But defo took 90 seconds with my IBD Just Gel lamp. The first one, at 30 seconds was still wet. At 60 seconds my second one was tacky. At 90 seconds my third one was cured.
I used it over acrylics on a client and it's been fine. Just made sure I made her do the three cures (light has a 30 second sensor) before stopping.
It doesn't seem too bad, and it's a no wipe top coat which I love.