I always wondered what the community meaned by dream - is it until a scene change happens, or it means an entire REM phase? Because i see my dreams as a continuum, aven during the scene changes, but if the first definition is used, my highest would be around 15 - when i once did several awakenings, one after every REM phase (and slept for nearly 12 hours - lawl what an epic night it was) and proceeded recording every dream, just for experimenting: i even recalled one 1:30 h after i got to bed, the first short REM phase that i usually forget.
My average, however, is another story, but thanks to a constant WBTB, i can say my average hovers above 4 dreams (or 2 REM phases).