now I see the reason no reply what exactly is the ?, this reminds me of the ?'s in school Peter get on the bus doing 50 miles an hour and travels 20 miles, while Henry gets on bike and is doing 20 miles an hour, and travels 20 miles, Miles is walking in circles who gets home fastest?
So you vid is 12 mins long, you need 4 or more mins of watch time, and How many views do I need if 4 mins or more watch time required. You can have 1 person watch the video 1 time for 5 mins, the next person watch it for 6 mins, the next 4 mins 5 seconds, etc, and that is how many views you will have.
As watch time is based on how long each person watches your video not the # of views divided by the watch time eached watched, as far as I understand.