When one of those gigantic 20 crew contengents arrives at 8AM, then all of Basecamp will be jammed up early in the morning. You may want to see if you can call Philmont and see when other people are arriving that day. Please try to stick to the time that you give Philmont for when you check in. If a Ranger sees that the crew is supposed to come in at 1PM, then that morning is laundry day. I had a crew that came in several hours early and had to leave my clothes sitting in the washing machine all day.
Bus times are another consideration.
Sometimes the Ranger will be asked do you prefer 8 or 10. Don't ask your Ranger to get you a certian time because Rangers are told in training not to request a time. When choosing bus times, don't forget to take into consideration where your starting camp is at. So be sure to consider how far your starting camp is from the turnaround too. A 3PM bus to Ponil with Bent as a starting camp is not the best of combinations.