How long will it take for me to see final results after surgery on a brachioplasty? (Photos)

Significant improvement already.  Concur with your surgeon:  six months may be a reasonable amount of time.

The time it takes to see the final results after brachioplasty (arm lift surgery) can vary from person to person. In general, you’ll start to see some improvements immediately after the surgery, but it may take several weeks to months for the swelling to fully subside and for the scars to fade. Most patients can expect to see significant improvements within 3-6 months, and the final results may become more apparent after a year or more. Your surgeon will provide you with a more specific timeline based on your individual case.