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Linseed oil doesn't 'dry' - it oxidises. Contact with oxygen in air causes it to change chemically, becoming hard, like a varnish. That is why a thick coat of oil becomes gluey... It will harden...

The old adage for oiling a wooden rifle stock...
Once a day for a week,
Once a week for a month,
Once a month for a year,
Once a year forever.