“How long after jaw surgery can you open your mouth?”

Right away. Most surgeons performing orthognathic surgery today would NOT have a time frame after surgery requiring you to have your mouth wired shut unless there were complications.

Most of the time immediately.

Thanks for your question! The answer depends on what actual jaw surgery procedure you're planning to undergo. I can only speak for myself, but the majority of my patients are able to open their mouth at least a little bit immediately after the operation even in the recovery room. Of course, the range of motion of the lower jaw may be limited, again depending on the operation, for several weeks. For example, patients having only upper jaw surgery recover faster and with greater range of motion than patients having lower jaw surgery, because it's the lower jaw that actually moves at the hinge joint when you open your mouth. I hope this helps!

Depends. Few weeks to a few months.