It happened to me pretty much right away. Once the storage had been cleared from downstairs, nothing but clearness has come out. I can't remember how soon it was, but not more than two weeks for sure.
Nowadays I don't really do it at all, because pretty much the only reason I did it before was to clear the excessive materials that had a nasty way of coming out involuntarily if I didn't. Always hated it, so I'm very glad to be free from it.