YIKES! And what is your touring style on these long days? Are you taking it slow with a lot of breaks or going non-stop? My crew goes nowhere fast. Still, I might do that for 3 days, but not 9. For me adding more days should mean theres some down time.
I will give you two examples. These were our last two trips to Orlando.
October 2011: My daughters fall break, dd is 8, ds is 21 months
Wednesday: 5:15pm flight from NC to Orlando, cab to hotel, dinner, bed
Thursday: 9am to 5pm at Sea World
Friday: 9am to 7pm at Sea World
Saturday: 9am to 9pm at MK
Sunday: 2pm flight from Orlando to NC
That is 30 theme park hours in 3 days, but we took our time, took lots of breaks, repeated whatever we wanted, and spent over half a day in Happy Harbor, which is why we did 2 days at Sea World, where most people would only do 1. No one was over tired or worn out. My dd did have some difficulty the first day because it was 68 degrees at home and 84 our first day in Florida, but that lasted about an hour.
Now, let's take a look at trip #2
June 2012: My daughters out of school for summer and we are taking our long awaited 9 night trip to WDW. My daughter is 9. My son is 2.5.
Thursday: 8am flight from NC to Orlando, DME to ASMo, lunch, nap, MK from 4pm to 10:15pm
Friday: 9:30 breakfast at resort, Epcot from 10:30 to 5pm, then character dinner inside Epcot, back at resort by 8.
Saturday: 8:30 character breakfast, then MK from 9:30 to 3pm parade, back to resort, 30 minutes on resort playground, then rest
Sunday: 8:30 for rope drop, MK from 9am to 12:30, lunch in MK, back to resort. MK from 3:30 to 8:45 (BBB at 4pm, photos, rides, CRT at 6:40, Town Square Theater for some extra Princess time)
Monday: 8:30 character breakfast at Epcot, then Epcot from 9:30 to 2:30, then back to resort, pool time, dinner in the room
Tuesday: Rest day (breakfast in the room, resting and playing with toys), MK from 3:30 to 5, dinner at Ohana. Had the option to return to MK, but went back to the pool instead.
Wednesday: AM EMH at AK to 1pm, then back to resort for pool time, dinner at resort
Thursday: DHS from opening to 6pm (the plan was to leave after the afternoon parade, but my children had way more fun in the Honey I Shrunk the Kids playground than I expected
Friday: AK from 10am to 3pm, back to resort to change, then Chef Mickeys at 6pm
Saturday: 9:30am breakfast at resort, resort arcade, DME departure at noon, flight home
On a longer trip IMHO, there is just no need to have all of those long days, especially with a small child. I realize you might not be able to have pool time, but I still think at least a few "half days" would be good. It is important to get time off your feet and get enough rest. Don't under estimate the time it will take to get settled after getting back to the room at night. The body and the mind has to come down from way more stimulation than it normally gets in a typical day.