Hmmmm, well to break it down.
15 mins of prep work(jack car up and onto stands, get sockets and such, put on gloves, set tv or radio to something I could stand to put up with for the next 30 mins or so, remove drain plug)
It takes at LEAST 30 mins to drain all the way out to where it just drips slowly. So while that is going on...
Place cardboard under area where filter goes on, loosen filter, then hand unscrew it, clean filter mating surface, screw on new filter, tighten)
This stuff likely took 5 mins or so.
Still have at least 20 mins of draining. So I give everything under the car a once over for leaks, damage, dead animals
By now, the oil is all out.
In the process for like 45 mins now.
Replace plug, refill with oil. 5 mins.
Start up and let run for a few minutes and check oil level and top off to full level. ~10 mins
So I guess I would say if I was just straight out going for it I could do it in 1 hour. But usually my changes take 90 mins or so, this is because I usually yack with someone while doing it and it skews the averages