An oiled oak surface asks for twenty minutes a year, and repays it with something close to immortality. This is the trade you accepted, perhaps unknowingly, when you chose oil over lacquer: no plastic film to fail, but a surface that drinks, and eventually thirsts. You will know it is time when the wood looks grey and dry rather than warm, and water dropped on it soaks in instead of beading. For most desks and tables, that moment arrives once a year, twice if the surface works hard.
The ritual, in order. Clear the surface entirely — this is oddly the most demanding step. Wipe it clean with a barely damp cloth and let it dry. If there are scratches or grey patches, sand lightly along the grain with 240-grit paper, dust off thoroughly. Then pour a little hardwax or pure linseed oil onto a lint-free cloth, never onto the wood, and work it in with the grain in thin, even passes. Wait fifteen minutes, then — this is the step that separates good results from sticky ones — wipe off every trace the wood has not drunk.
What comes back is startling the first time: the grain deepens, the honey returns, small scratches vanish into the refreshed surface. Leave it overnight before setting anything down, and lay the oily cloths flat outside to dry before binning them — bunched, linseed cloths can self-heat, and this warning is traditional because it is true. Then put the date in your calendar for next year. Twenty minutes, once around the sun, and the desk simply never becomes old. Few maintenance rituals pay this well.