BillyS - 3:10 am on Apr 14, 2011 (gmt 0)
Same here, took about 15 min.
I first thought the process was frozen but then it went through, so don't be surprise if the progress bar for a while (a long while!) does not move.
Not sure why that happened, admittedly I'm working with a SSD, but the entire process was less than two minutes, including downloading the 23 files. The reboot process was about 30 seconds...