It shows the last 10' by default but you can set it to show 20'/30'/40'/50'/60' - now don't be surprise (like I was) if it still shows 10' after you change that setting as it will "ramp up" as you pass the 10' mark.
A bump for a cool DF !
Been experimenting a bit more this time keeping the 10' interval and I'm seeing the same "flattening" of the graph after a while even if the range is small.