How long should I wait before wet sanding spray paint?

I'm painting side covers to my motorcycle and want to sand down the paint then apply a clear coat. I've put countless layers (20 maybe) of paint, really thin, like the first few didn't even cover the entire cover. I used Krylon Fushion Black Satin for the primer + base then used some generic brand for gloss black and now back to krylon clear coat. It's kinda rough so how long should I wait to wet sand it?