How to install Visual Studio SP 1 in less than an hour

Visual Studio SP 1 update is all over the blogs now, however there are many reports that the install takes a long time (over 2 hours), I managed to install it in about 30 minutes by shutting down every program and stopping a bunch of services (except machine debug manager, I don't think is necessary but didn't want to risk it) and that was it, the installation finished really quick, hopefully it'll do it for you too

Update: on my old machine (where I just installed Windows Vista a few days ago), it took 20 minutes by following these simple steps