How long does it take an ebook to show up in my barnes and nobel reader library?

I just downloaded a book from Barnes and Nobel and clicked the "download" button on the My Library screen, but it's not showing up in B%26amp;N desktop reader. Is it just taking a long time to download or did I do something wrong?|||It usually shows up immediately. Close the application and start it over again, if that doesn't work restart your machine, sometimes computers or applications or both can act buggy for some reason.