We had planned to go to Disney and stay at least 6 nights, with at least 6 full park days (no hoppers) until we saw the military discounts. Now we are staying for 5 nights, but will only have 4 full park days because of the Military Salute park hopper tickets. Will we regret having only 4 days? It will be 4 adults, 2 kids- ages 8 & 1. I know it's really all a matter of personal preference but I was just curious as to how many people actually only spend 4 days in the parks. We plan to do 1 1/2 days each at MK and Epcot and split the remaining day between AK and HS. We're really not too fond of HS and will probably only hop there at night to see the Osborne lights. We are going the week of Thanksgiving, 11/19 - 11/24 with our actual park days being 11/20-11/23. I know it will be packed and am ready for the crowds as we have been during spring break but I just hope we can do our favorites at each park, which is basically everything at MK and Epcot 

I think you and your children will be appreciative of the 4 days and you can always come back and it's so nice you are getting the Military discount, well deserved and you will have a wonderful time!!!!!!!!! My son is 11 and he only likes MK, yet he has never been to HS yet, but you will really enjoy it!!!!!!!!!! 4 days is a nice amount of time.
Hope you have a fantastic trip and lots of fun!