i don't like the idea of 'training body parts'.
train exercises and types of motions... as those exercises progress, so do the muscles involved.
i train similar exercises virtually every day. one day i'll do shoulder width grip underhand chins, the next day i'll do wide-grip overhand chins, the next day i'll do bent-over overhand barbell rows, etc...
it depends on your program and your conditioning.
here is the golden rule: if your performance is improving, you're moderating your volume appropriately, if your performance stalls or regresses, you're doing something wrong .