Heheh... I got the same problem at my shop since the lathe is in the back room and I can't tell if customers come up when I'm back there so it can be difficult to play with the lathe or the CNC since I need to keep checking up front. I', planning on getting some garage sensors so I can tell when people drive up so I can play in the back more when it's slow.
Other times I'l go to the shop on Sundays or stay late and close the doors then I can work in peace. Hopefully in the near future I can hire another mechanic to help out and I can break off and do my stuff in the back, but for now I just gotta set up the machine but walk up front every few minutes, make a cut pass, check for customers, make another pass, check for customers and so on...