I got my passport back with H1-B stamping on Nov 7. It took few extra days because of PIMS verification, and tihar holidays but it was not more than one week.
Also, I was little worried because USCIS denied my COS from F1 to H1 saying I was in violation of my student status as I was working on CPT and my college was in west coast, I am working in south but consular didn't raise any question on that.
It was an easy experience but had to make an emergency trip because of denial of change of status.