All my 3/4" 45 minutes to an hour. 1 to 1 1/4" 2 hours 1 1/2 and 1 3/4 soak for 3 hours 2 inch or more 5 to 6 hours. Then they will drip dry till all the mineral oil has run off and soaked in. Then i let them sit one day and put on my HOT beeswax mineral oil polish. Or my bees wax coconut oil of which is also food safe.
i buy my oil buy bulk each gallon is 7 lbs in weight. I buy 8 gallons at a crack. $51.90 dollars for 4 gallons Or it comes out to $1.87 per 16 oz. Alot cheaper than buying it in the cutting board 8 oz bottles fo like 9 dollars.
here is the company i buy from
http://www.bulkapothecary.com/raw-ingredients/bulk-natural-oils/mineral-oil/
Jeff Vandenberg aka "Woodsconsin"