Used to be 12-14 with guts in. In the chiller obvs. Ours lived on grass and scrub land., they were moved onto fresh pasture fortnightly. They were then finished on apples for the 4-5 weeks, this was about a gallon bucket per day, plus growers pellet add lib. Fat as butter, little to no basting.
Haven't done them for 8 years. I paid £80 today for a 5kg Norfolk Bronze reared the same way by my neighbour.