I haven't given much tnought to your scenario, but i would hate to leave it fouled for more than 24hrs. I used to clean my more modernish gun with windex. Also my 58 remington. Spray it on and fouling melts right off.
Maybe decap, wet a patch, and wipe out the dirty chamber and barrel. Dry, wipe well with oil of choice, wipe off excess. Reassemble, holster, and back to work you go. Try it, its quick. And then you'll have the answer, better than we can provide. You'll have a good look into the 1800s at the very least.
Please let us know how it goes, my curiosity is peaked.