It's more of a what type of work that you do question. We do all public work so, I have one person in the office bidding and one in the field handling 3 crews, for us it's making sure the work that we take on is timed right ( not looking at opening up 5 jobs at once). Now doing homeowners would make it a different story, you have more flexability because you set the schedule (install work only), weather also plays a big part, we just can't control it
Your equipment and crew efficiency and ability of crew leadership play an important part too. If you have crew leaders that know what is expected of them and they have the ability to handle it.
It all comes down to leadership, jobs and your ability to let go of hour to hour or day to day responibility and hand it down a notch.