I've had the experience of activating them, and having them stand down. We were quoted 45 minutes plus travel time for activation on a Sunday afternoon. Unfortunately with the weather we have here, half the time we would wouldn't be able to fly them, so we'd have a significantly longer wait.
I think FDNY at one point had 1 or 2 designated field surgeons, but I read that many years ago before they implemented their rescue and haz-tac programs.
What part of the state were you in? I was across the Bay from Baltimore, so a flight would be maybe ten minutes, but by ground would be around 1.5 hours.
My friend flew one in in PG County last year for that man stuck in the industrial machine, but I don't think they amputated.