How long after lower jaw surgery can I get porcelain veneers?

Congratulations on going ahead with repositioning your jaw. I am sure you will appreciate the balance in your facial appearance. I would begin the process of doing a wax prototype for your upper veneer work after the oral surgeon and orthodontist agrees that the bite is stable. That way you ensure that chewing function is optimal to go with an appearance enhancement and things do not move unexpectedly. 
Veneers can be completed from start to finish in a month or less depending on your initial teeth arrangement as I do not have any photos to assess.Best regards,
Ed 

Edward Lowe, BSc., DMD, FICOI, FACD
Editor-In-Chief, Journal of Cosmetic Dentistry 
Accreditation Examiner, American Academy of Cosmetic Dentistry
       

as long the wires are off, you can start doing your veneers,for sure,but wait till the surgeons instructions,but yes you can have great results in just a couple of days.