Currently you must time your personal power hour, it would be a nifty enhancement to see the time remaining on your equipment menu where other stats are located or if not possible in the store on the pph tab or chat text if you try to use another one showing time not just you already have one active.
Currently you must time your personal power hour, it would be a nifty enhancement to see the time remaining on your equipment menu where other stats are located or if not possible in the store on the pph tab or chat text if you try to use another one showing time not just you already have one active.