"10-15 passes with a bronze brush soaked in alcohol. I think this accomplishes removing the copper solvent and then etching the remaining copper, making it more porous to dissolve away."
I won't comment on a poorly machined, non-lapped factory barrel. Maybe that's what you're working with...
But for a good custom, hand-lapped premium barrel, I think you can get away with way, way less brushing. Put some wet solvent patches through the bore when it's warm. Possibly brush 3-6 strokes if your barrel fouls badly. Then apply Wipe-Out, wait a minute (for bubbles to dissipate), then apply Wipe-Out a second time, then let it soak 3-4 hours.
I really don't want to say more because many people are convinced they need to do a lot of brushing. I had an AR factory barrel that did require that. But did my Krieger, Bartlein, and Brux barrels need lots of aggressive brushing? Heck no.
Yes I realize some famous guys have set world records brushing aggressively every 50 rounds. That CAN work. No question. But for a lot of good barrels, you may be able to get away with much less brushing. Way less. You may find: 1) You need fewer fouler shots; 2) You save a ton of time cleaning; 3) Your throat doesn't move as much; 4) Your crown stays perfect longer; 5) Your effective barrel life is extended.
I suggest starting conservatively and then see how it works.