When I was little, my family and I would stay at Disney from one to two weeks. We would do everything we possibly could in that time period, and it would either be once or twice a year.
Now I don't go with my family, and I go with other families. Our trip, from beginning to end, usually lasts for ten or eleven days, but we're usually in the parks for seven, eight, or nine of those, because we either drive or take the train down, which adds a lot of extra days.
This time, I'm going with a different family (I don't just tag along, I'm invited, lol). They're not afraid of planes like the other family is, so we're going on a plane this time. But we're only staying in the parks for five days, including the arrival day, and then we're leaving on the sixth day in the early morning.