Took about 2 hours at ours but that was just a simple install the modem and router next to the master socket. Includes time the engineer took after this at the cabinet and then back at the house on the phone to the helpdesk to get the "red light problem" fixed which took about 30-45 minutes.
The red light problem being a problem with the HH2 firmware at the time where it wouldn't connect to the modem. I suspect this problem is long fixed though.
--- BT Infinity 8th July 2010
600m (approx) to cabinet
25.5mbit down / 7.6mbit up