As long as the items don't overlap in the bag you can treat multiple items the same as a single when looking at time.
What cut of chop are they? Neck chops will need longer than loin chops. But for loin chops, 2 hours will suffice. Any low work muscle needs little more than bringing up to temperature. 2 hours tends to be a favoured time for most naturally tender meats that would be served as a steak or chop depending on thickness.
At only 3/4 inch thickness you will need to be very quick when you sear them after cooking. Make sure you dry them very well and give them no more than 30-45 seconds per side in the pan.