We have all skipped a lunch and sorted the truck before start time to save time when we first started. I suggest you do not make a habit of it everyday, but it's your decision on how you work, it's your life. If you are on EDD, then you can glance at your day in the DIAD. See where your bulk stops are, your air. Get a mental plan for the day. I usually go off trace to get some of my bulk out of the way so I have the room to manuver. Deliver air first, if you can get the ground pkgs off at that stop too, good, but there is no harm if it's just the air when you're short on time.
Somedays it feels like running a UPS route is like trying to make sense of a kleidiscope that someone else is turning. They never look the same twice.