I have to put in 3 outlets for 240v tools; only ever used one at a time. Two possible ways to do it.
1) Run the cable over the ceiling to first machine, along the wall to the second machine, over the ceiling to the third machine. Total length about 70'. While the third machine is only 11a, I figure that even if I put a 18a machine in later the voltage drop is only 1.7%
2) Run the cable to a junction box on the ceiling. Run one cable over the ceiling to the first two machines 40'. Run the second to the last machine 30'.
Same amount of cable, but #1 is largely along joists while #2 is through joists.
So, #1 is much easier, but I can't get over the fact that #2 is a shorter maximum length. But since 70' is not excessive, #1 is fine, right?
Oh I hate decisions; it is so much easier when there is only one reasonable choice.