I think the answer depends which specific jaw reduction technique you have.
A standard jaw reduction involves cutting/trimming the entire lower portion of the jaw bone. A more complex procedure is sliding genioplasty where the center of the jaw bone is sectioned and re-positioned and has a more difficult recovery.
I had a standard jawbone reduction and found recovery surprisingly easy. One thing that may have helped is my FFS surgeon used an ultrasound cutting tool to minimize disruption to nearby tissue, instead of a reciprocating saw for bone work. And made 3 shorter incisions inside the gum line instead of cutting all the way around the gum line. I was surprised to be eating solid food within a day and walking around Madrid 10 days later blending in just fine. I could have returned to work at that point, but everyone heals at a different rate.
If you're looking at a sliding genioplasty the recovery time I experienced won't apply at all.
