Ac joint pain from bench press how long to heal?

It depends: That sort of trauma needs to be evaluated by an orthopedist if the pain is significant. It may be ac joint but it could also be tendinitis, bursitis, rotator cuff tear or other issues.

Depends on grade: 1= 2-3weeks using ice rest activity modification. 2= some disruption of ligaments ; takes 6-8 weeks. 3=complete dislocation of the joint, all ligaments ; capsule torn, ; the clavicle rides high ; there's noted deformity, this may or may not require surgery depending on which orthopod u c. 2 schools of thought.