I would adjust that (for me anyway): Every time you play, double the time the box says. 
-
-
Thanks. Twitter will use this to make your timeline better. UndoUndo
-
-
-
If the box lists a broad range of play times, it will take double the longest one. If it lists a time per player, that will be close to accurate.
Thanks. Twitter will use this to make your timeline better. UndoUndo
-
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.