If the inbound is from a domestic flight (like MIA) it may well be a one hour turn. AA does this all the time, have unrealistic turn times. Still, if you board around 6:40PM you should still be able to get off the gate by 7:10 or 7:15 if the GAs actually have their act together. If you're in Business your PDB, if you even get one, will likely be a choice of warm water or warm OJ.