*chuckle* I was given an 8 hour window ... and I started 2 hours earlier than that just because I didn't want to take the bureaucratic chance that I would have been screwed over and had to wait another week.
The guy that installed it said that mine was the easiest setup he had done all year because my basic setup was 98% complete, the components exposed properly to be worked upon, and the house fully run with existing cable tv. All he had to do was drop the box down, plug it in and turn it on. In and out in 10 minutes.