Four stages, four photos, roughly a week between the first and the last as the oil cured properly between coats rather than being rushed to a finish that would only look right for a month before dulling.
The difference between "sanded" and "finished" is almost entirely patience — nothing in this process is difficult, it's just slow if done properly, and every attempt I've made to shortcut a stage has shown up clearly in the final sheen.
Starting at 80 grit feels almost too rough for a board that's already reasonably flat, but skipping it in favour of jumping straight to 220 has left visible mill marks under oil every time I've tried it. The rough pass does real work even when the surface already looks fine to the eye.
Between grits, a good five minutes with a tack cloth matters more than the sanding itself in some ways — walnut dust is fine enough to work its way back into the grain if it's not properly cleared, and it shows as a dull patch under the first coat of oil if it's still there.
The oil itself goes on thin, in multiple coats, rather than one heavy application — each coat needs a full day to properly soak in and start curing before the next, which is the part of the process that can't be rushed regardless of how tempting it is to just get the thing finished and back on the wall.