ten minutes or less. Before cleaning the inside, I remove and wash the lock, using a toothbrush to get into the corners. Also wash off the barrel exterior around the lock. I pull the vent liner ( put them in all of my flinters) and screw in an adaptor with a hose to a pop bottle of soapy water. Pump with a patched jag for a minute or so, change to clean hot water, pump some more. Wipe and dry until patches come out clean, then squirt some G96 down the bore, and spread it with a clean patch. When I have wiped the g96 in the barrel, I use that patch to wipe down all of the exterior metal, including the lock. put the odd drop of oil on the friction surfaces of the lock, put it all back together, wipe down all of the wood (including the ram rod), may or may not apply a bit of oil. Store muzzle down to allow any oil or whatever in the barrel to drain out. (Nothing like a gob of oil-soaked powder to screw up your first shot). I NEVER load a flinter without poofing off a small load of powder first, because it's such a pain in the a__ to fix a soaked load. No point stuffing a ball down a gun that won't fire. The picture is of a ball discharger which allows you to use a bicycle pump to push out a stuck ball. With the valve removed, and a piece of tubing attached, it works for flushing the gun. They will work the same on a cap gun if the nipple threads match.