1.0 Mile at 60 MPH equals One Minute plus loading time......or even 2.0 minutes at 30 MPH.
( 1 mile @ 3mph = 20 mins)
Having done one skid rooftops at night on NVG's....it is not the difficulty of the maneuver that is in question....it is the Risk/Gain issue.
Please do remember very few EMS transfers (Damn Few actually) get done by helicopter at night in the UK....so just how critical is a few minutes in your system. If you discard the need for timeliness at Night...why get your knickers in a knot over a few minutes in the daylight?