How long roughly does it take to see results after smart lipo on the chin? (photo)

If your surgeon is relying on the laser energy alone to "melt" the fat and have it absorbed, it may take up to 12 weeks to see results.  This however is an unusual technique as aspiration is usually performed with Smart Lipo.  Using aspiration, some result is immediate with final results occurring around 6 months.

The SmartLipo laser does destroy treated fat cells by heating. However, three days is not long enough to judge the outcome, especially since the swelling that occurs naturally after surgery will temporarily mask the result. While good results may be seen as early as four to six weeks, the final results takes three to four months. An important distinction with your case is that I always suction fat to allow contouring of the neck at the time of surgery. In my experience, this is a more reliable way to get the results you want because fat is physically removed and does not rely exclusively on the laser by itself. 

There is absolutely no reason why you shouldn't have had aspiration, you should have.  Laser alone is not enough. With VASER/ThermiRF you see immediate results.  Please see an expert for a revision.  Best, Dr. Emer.