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A set-aside ability is always followed by or paired with another ability that is not a set-aside ability but rather is anongoing ability that lasts as long as all of the cards targeted by the set-aside ability remain set aside. The ability thatfollows or is paired with the set aside ability defines the benefit gained from being set aside or when the cards setaside should be returned (i.e., a duration).
Nope, you get one chance and only one chance in SI. The only exception is if your SI ending ability is interrupted or negated thereby re-causing SI.