I am now 3 hours deep into an SP3 install on an Exchange 2010 SP1 server.
I have read this can take some time..hours depending on one's setup. I have 3 hours and 7 mins into the hub transport role stage. CPU usage is down to 0-1% most of the time and AV is disabled.
I don't want to kill this if this thing is really doing something, but I am almost to the point where I need to start a server restore to get mail back up and running.
The server is running Windows 2008 R2