I'm not racing, but about 15-20 minutes is probably pretty normal. There are some videos on youtube that show how those individuals load and unload. Some show alignment methods. Electric jacks do make it quite a bit easier since multiple jacks can go down at one time. You do need to watch though. Sometimes jacks will go slower/faster than the others.
I think there are more things to do with a truck camper vs a trailer. I haven't loaded a fifth wheel, but it's probably in the middle between trailer and truck camper with the trailer being the quickest. The time isn't that big of deal unless you were going to do it a few times a day.
1. Back in spot.
2. Unlock and remove fastguns rotate jacks to clear drw fenders.
3. Open compartment that has my jack switch and turn it on and close the compartment.
4. Raise the jacks with remote.
5. Validate the jacks have raised the truck up far enough to pull out.
6. Pull out part way, stop, and unplug camper from bed.
7. Pull out far enough to lower camper.
8. Lower camper.
9. Open camper and turn off battery and open the fridge/freezer.
10. Store my fastguns. I have heavy clear runner plastic that I roll them in and put them in the camper.
11. Lock the camper and side compartment that holds the jack switch.