Hi,
If you go to the east coast of the US (Miami, New York, Boston and Washington), India and Lagos you only stay 1 night so they are generally 3 day trips, west coast and far east (Los Angeles, Shanghai, Narita, San Fran) you stay 2 nights so its a 4 day trip, you also have Jo'Burg and Cape Town, which are varying in lengths for the winter season.
I cant really speak for the Jumbo trips as they have such variation in patterns when flying to the Carribean.
My bet would be to go to Jo'Burg or Shanghai...
Good luck.