WE did the dolphin encounter, not the swim so our video was about 10 minutes long. There is a group of 8-10 of you on the video. You will see each person touch the dolphin, kiss the dolphin, dance with the dolphin, feel the dolphin's teeth and hug the dolphin.
AS soon as the encounter was over, there is a gift shop where the video can be purchased. I think we waited about 20-25 minutes to purchase the video. We looked around the gift shop and looked out over the water in the back of the gift shop. It was well worth the wait.
I was on the Wonder, not the 7 day eastern cruise when we did this. I believe they have a dolphin encounter on the 7 day but cannot give you information about shopping afterwards. You do need to book this excursion 60 days out. It usually fills up very quickly. The swim seems to be more popular than the encounter. I have one child under 6 so we had to do the encounter. You have to be older (not sure of the age) to do the swim.
Hope that helps.