Having had from 3 to 14 direct reports the ideal is probably around 7. Too few results is too much attention ("hey boss I have a job to do") while 14 results in

Having had from 3 to 14 direct reports the ideal is probably around 7. Too few results is too much attention ("hey boss I have a job to do") while 14 results in total burn out and neglect ("we haven't spoke in weeks - what is your name again").