Subrule · Chapter 8
cr:8.5.11a
If a duration is not specified, look is a discrete effect and the player(s) may look at the specified object until the next event in the game occurs. If a duration is specified, look is a continuous effect and the player(s) may look at the specified object for the duration as if it were a private object they owned that is not in a deck..[3.0.3]