KMail taking long subscribing with IMAP

I have a ~/mail dir that is 2.4G in size. How long should it take for KMail 1.7.1 to sync where I can subscribe? Also, is there a way where I can subscribe the whole of ~/mail without having to subscribe to each file/folder? If not, then it will take me forever to click on everything. Both servers are slower SGI's with IMAP, and the client is a 2.8G P4 laptop. This is all over 100BT. Thanks eric