It's certainly do-able on a 319 so long as you have a loading conveyor or you can throw the bags on the back of a flatbed truck. We routinely turn a 319 around in 30 minutes and at least 10 minutes of that is waiting for the pax to disembark out of a single door then getting the cleaners on board to give the whole thing the once over then getting the catering on. If we ditched the catering and had the cabin crew clean from the back as the pax disembarked it'd be 20 mins no problem. Laading the hold could be a problem if the bags arrive on one of those tiny trolleys, but it appears there's not that much in it between a 319 and a 700 in that sense.