After my top coat, I applied two coats of the Magnetic FX. Immediately after the second coat, I put the magnet to work.
There's no rule as to how you hover your nail against the magnet, but I found resting the plastic on the desk easiest. Because my nail was still completely wet, I didn't want to bump it.
You must hold the nail against (but not touching) the magnet for 10 seconds.