We did two weeks twice in 2001 and 2002 because the summer camps always ended two weeks before the kids went back to school. We'd do 5 days in the parks, 3 days in the water parks, one day at Uni and the rest was downtime, e.g. laundry, shopping DTD, swimming in the pool. 2001 will always stand out because when were in the limo driving home to CT (on 09.01.2001) I pointed out the Twin Towers to my DSs (then 11 and 6) and said we'd go see them some day.
10 Days with a group in an OKW Grand Villa. I was a tag along with friends and their families. 9 nights on a fold out couch isn't super fun. Fold out couches are the low point of DVC.
Doing 9 days this June - 8 nights at BCV and the last night near the airport (early flight back). I'm not sleeping on the couch - but here is hoping the new ones with the renovations are better.