Broke jaw have nerve damage to the inferior alveolar nerve bout 9 weeks ago most of numbnes gone but lip and chin tightness remain , how much longer?

Depends: Depends on the severity of the injury. In this case sounds like shearing or crush injury but sometimes if it's stretch with no damage to the axon it may recover quickly. Otherwise, human axon growth rates are 1 mm/day in small nerves and 5 mm/day in large nerves. If there is no way the nerve would reconnect then maybe permanent but best to check with a maxillofacial surgeon. Best of luck!