If you spend a little extra cash on a nice wooden chopping 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 chopping board with oil.
Photo by Jarrod Lombardo.
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 chopping 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 chopping board for years to come.