The denser wood is, the harder it is to dry artificially without causing major defects. In commercial kilns, heavy woods like oak may take a month in the kiln to dry without harm. Osage and locust are even more dense than oak, so they would have to be dried at low temperature with humidity in the air to slow the drying, for a long time. Weeks, at least. Commercial kiln operators use very complex schedules, adjusting the temperature and humidity several times in the process.