Maintain a Wood Cutting Board with 5 Minutes of Work a Month
If you spend a little extra cash on a nice wood cutting board, you want it to last for a long time. As The Kitchn points out, the best way to do that is to regularly maintain your cutting board with a bit of oil.
As far as general maintenance is concerned, The Kitchn suggests keeping up your daily cleaning with a bit of soap and water. Beyond that, they recommend you scrub your cutting board down with a lemon and salt mix once a month, let it dry, and then rub it down with mineral oil (or another food-grade oil). Let the oil soak in overnight, and then remove the excess oil the next morning. That should maintain your cutting board for years to come.