With the length of the trip, you can and should slow down. Dont go until exhaustion it is too hard to recover. It is also still too hot there to be touring all day.
We had a 9 night trip in June and the number one rule was that we pace ourselves. We only did the midday break thing once, but if we started at rope drop, we were back for resort time around 3 or 4. When we wanted to see fireworks, we didnt go to the park until 3 or 4, which is usually our day 1 plan. By the time the fireworks were over wed been there 7 hours. That is plenty. We also did one day where we toured from 10 to 5, which included a one hour sit down at a kidcot fun stop while dd colored and my son slept, then more touring until 5 when we changed for an ADR, then had dinner in the park then went back to the resort.
We also had one no park day in the middle where we just had a reservation at Ohana around 5:00. Now since wed had some rain, and this was a sunny day, we did leave our resort a little early to spend some time at MK since we had to take a bus there to get to Ohana anyway. After dinner we took the monorail back to MK and I gave dd the option of going back in for a while and she said, No thanks, after all it is our rest day. So we walked by it and on to the bus stop.
We had one 10 hour touring day surprisingly at DHS. We had an 8am ADR, then toured the park. My plan was to be done after the afternoon parade, but my children discovered the Honey I Shrunk the Kids play area and we were in there 2 hours. We didn't get back to the resort until almost 6, but they still had energy to burn going by how they ran chasing each other around the resort after we got off the bus.
Also remember if you continually wear yourself down you are also wearing down your immune system.