5 Days would be my absolute MAX. By day 4, Im getting worn out and ready for my house, my pets, my bed....LOL. I can't believe how long people stay sometimes. I must be getting old or something!
Although, maybe by staying longer, you can take it slower/easier, so you're NOT totally whipped out by day 4!
I'm not sure what I would do with 10 or more days. I find the sweet spot to be 5-6 park days, 7-8 total nights. MK warrants 2 days, Epcot 1-2, AK 1, HS 1. However, an average time away from WDW in my household is 8 months between visits. I guess I go often enough to get my fill.
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