My dealer makes sure that they have the tape ready for when they make the initial appointment, apparently since they know that they are going to need it in any case, and there is not a supply limitation for it. I assume that GM ordered enough for every car, plus some overage for errors.
If the sensor is working, they pull the seat, apply the tape, reassemble everything and you are done. 45 minutes sounds about right.
If the sensor is not working they order the new one and make a second appointment when they have it in hand. That change can also take about 45 minutes.
Sky NA 2007 Midnight Blue
Sky RL 2008 Carbon Flash - Naked