The entertainment system (called Delta Horizons) has a main menu from which you can choose the following:
--video entertainment
--audio entertainment
--games
--AirShow (moving map showing your location, and facts such as wind speed, time to destination, etc.)
At Video Entertainment, there are generally eight channels (if I recall correctly). One of the channels is the main cabin progamming (what is on the big screens in coach). One is the AirShow. The rest are the BusinessElite channels. Each channel has two cycles. They will play the entire first cycle first. Once that is completed, they will play the entire second cycle. If time remains, they will repeat the entire first cycle. If there is still more time, they will replay the second cycle. There will be a 15 minute intermission between each cycle. Each cycle (A and B -- first and second) has different programming for each of the five main channels. Most of the channels have a movie and a short feature (sitcom, CNN IN-Flight, etc.), while some have a number of short features.
Of course this is assuming the lead FA knows how to work the system and keeps switching the cycle tapes or whatever.