New Firmware Version 1.02.12 for the My Book World I & II (10/19/11)

I started the update process through the web based interface and it has been running for an hour now but the progress of firmware update page is sitting at 70% for the last 30min. Since it says not to interrupt the process I’m wondering how long to wait before I need to do something. And what that something might be that I need to do?