Remands are definitely supposed to be treated as priority, but I don't know if 6 months is the an actual goal.
When my case was remanded, the OHO said it would probably take about 13 months. My lawyer, however, said it usually doesn't take that long to have the hearing scheduled when it's a court remand...he said "six months is more likely but it could be longer". That's a quote from his email to me, BUT that was 2015 (wow!) so things certainly could have changed for the better by now.
Incidentally, my hearing was actually scheduled 5 1/2 months out, but then delayed twice.
