I was just told upon returning at MXP that it's "un'ora" there. (In fact he then said, "One hour, two hours, today, whenever," because there was an accident between Milano and the airport. Never heard THAT before. Must have been a pleasant surprise to those caught in it when they finally turned up. Blessedly, I came in from the west.) I didn't even cross into it as I hadn't asked when I picked it up. All my other rentals of late - domestic - at all agencies including Avis have been 30 minutes, except Dollar, which is now 15 minutes, I think.
If this aspect is very important to you, remember the special value of being a Hertz #1 Club Gold. @:-)