To properly clean a black powder rifle takes at least 1/2 hour if you hurry.
You've got that about right
Swampman, maybe even 45 minutes at a leisurely pace.
After my 50-shot session Sunday with my Great Plains flintlock, I wiped the bore with three or four Windex patches, followed by an alcohol patch, then an oil patch, and wiped the lock down with an oil patch. So I needed to do a thorough cleaning today, and decided to check the time at the beginning and end of the cleaning session. Here's how it went.
1. In my junk room (computer, guns, gun stuff, hunting clothes, magazines, unused tread mill, etc.) I removed the lock and barrel and took the touch hole liner out of the barrel.
2. Took the lock and touch hole liner to the kitchen and gave them a scrubbing in the sink with a tooth brush and dish soap under hot running water. Took them back to the junk room and set them aside to dry.
3. Took the barrel and cleaning rod and old towel to the kitchen. Filled a half gallon plastic tub with hot water and squirted some dish soap down the bore. Took the barrel, rod, and tub out to the patio, put the breech end in the tub of water and pumped the heck out of the bore with a patch on the cleaning jag. Then flushed everything out with the garden hose and wiped it dry with the towel.
4. Back in the junk room (my wife calls it "his cave") I ran a few dry patches down the bore, followed by an alcohol patch, then a RemOil patch. Wiped the outside of the barrel and the lock with an oil patch, and the metal parts on the stock, and put everything back together.
TOTAL TIME = 31 minutes. And you know what? I enjoyed every minute of it.