No need to PhotoRead again. Once PhotoRead it's PhotoRead. PhotoReading more than once is recommended when you are studying something new. The subject is new or when you are having difficulty understanding or activating.
You can activate a book years after PhotoReading it again. Since PhotoReading only takes a couple of minutes you may do it as part of your activation. Once it has incubated PhotoReading then activating works well when studying.
Alex
