You make a reservation on the traditional car rental website
You make a whole trip to the rental office, you arrive at the counter, you wait for your turn, you sign papers, you swipe your card in the “machine”, you wait for it to be approved, you wait for the car to be brought to you
The car arrives, but it's something "similar" to the one you booked. The car rental office employee "explains" to you that it's the same category, so "there's no difference."
The car rental office employee checks the car externally, checks it internally, checks the gas and mileage tables, asks you to check it too, gives you the papers to sign, gives you instructions, makes a little more small talk, and at some point you're ready to leave.
Time: > 1 hour