Sorry, misread.
I don't think it would be a bad idea for players to record their games (be it FG, Arena, PvP, etc.) to put on the stream. Window size could be 30-60 minutes, or just short bursts in between songs/playlists.
Better yet, combine the two.
music
music
content
music
music
content
music
content
content
music
music
content
content
music
content
music
music
content
music
music
content
break
break
break
So 12 slots of music, interspersed with content, with a couple extended content periods and a 3-hour break, which doesn't even have to be a break.