I do this regularly as well. I got the OBK grain crusher and even with a feeler gauge, it was closing a bit when I secured it, so my gap is more like .030. I gave it a go and got a stuck sparge my first brew with it (of course), so found this process and have not had stuck sparge issues since so I haven't bothered readjusting the gap. A wheat would probably be pushing it though, so I think I will readjust before I do one.
I only leave it for 10 minutes as its enough time to soak into the husk, but you don't want the water absorbing into the core.