I have noticed that touring in a small group (or even solo) is far more efficient than traveling in a large party. I have a theory that for every person added to a solo party, you need to add one minute of touring time per hour. For example, if you have a party of four - you need to add in a 3 minute break per hour to catch up for inefficiencies. If you are traveling in a party of 10, you need to add in a 9 minute break per hour to catch up for inefficiencies. Obviously, this breaks down if traveling in a group of 60 - you’d accomplish nothing!! LOL It may not occur every hour, but over the course of a park day, I think you accomplish less with a large group. (Longer meals, extra restroom breaks, waiting on a group after you split up for a ride, etc.)
I was thinking you might need to add 2 minutes per hour per small child, elderly, and individuals with special needs.
I always mark the slowest walking pace, but that still does not seem to account for all the diversions of traveling in a large group. What do you all think? Help me refine my theory.