Depends on the park.
MK, we usually visit 3 times, and generally stay longer, 10-12 hours or more.
Epcot we usually split into two days, one early, one later, about 10 hours each.
AK usually 1 full day, open to almost close.
DHS, I feel, has been somewhat neglected, and we usually visit it once, getting there early, but often with an early exit, 8-10 hours.
With young children, you never know, but if they're excited and active, they might not mind the long days if you take time to relax in between.
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