The best way to describe bees in labour intensity.
Two to three hives, not so bad. Once a week check, as a beginner, 20 min per hive. This includes suit up time. A bit more time during the times of disease monitoring and swarm prevention or requeening, maybe 1/2hour per hive when going through the boxes.
Adding honey supers during the flow, and where from 10 minutes to 1/3 hour per hive...might notice a problem.
Pulling honey can happen 2-3 times during the flow. Allow an hour per hive. Spring feeding and fall feeding and treatin during those times, anywhere between a 1/2 hour and an hour per hive especially if you have to mix sugar syrup. And that could be 3x a week for a couple of weeks.
Extracting...If you are sure your friends have no AFB and they have been tested to be clean, I would say extract at their place. But you have to be carefull of disease since it lives in the wax. This would save you $ for extracting equipment, and you can pay them a bit of money for electricity to keep the hot room hot, and rental of equipment...or work out a plan with them.
If they have some AFB, look for your own equipment. If you get AFB the only cure is to burn the infected comb, and destroy the bees, and scorch the wooden ware.
Depending on the type of extracting equipment you get to use and the # of boxes, could be anywhere between 18-30 hours to do total time + clean up. If your friends have a cool inline system, you could be looking at an hour or so.
Now if you have more hives, spring work up could seem like a tight fast and furious calving season, especially when the swarming time descends upon you. If not watching and checking the hives for room, late spring, you could be out catching swarms, and think calving was way easier.
After your first year or two, your time working is the hives will decrease with experience. Then, once you get the hang of it, watch out. You say now 2-3 hive. In 5 years you will be at 100 + hives...