Bullklr-
Healing time for tennis elbow (extensor tendonitis) is variable. It can take up to several months. It is not like back pain, where certain exercises can help speed the recovery process. To my knowledge, there are no specific exercises that you can do to help. Best thing to do is to not do whatever is causing it to hurt.
There are wraps that you can put around your forearm to help take the load off the extensor tendon mechanism. These wraps do help some with the pain and let you continue to use you arm in a fairly normal manner. Aniti-inflammatories like ibuprofen work too.
Good luck. Been there, had that, and even treated that.