Was about to commit it, but the time displayed is minutes : seconds, so shouldn't the unit be something like minutes:ss?

hh:mm would seem appropriate on the graphs, and the axis labels usually appears on the graph axis.

I see m:ss on charts of very short replays, so it seems problematic to only add min.

Perhaps it would be better to have the unit right after the number, i.e. 46s, 1m 28s, or 1h 20m.