If possible, it's best to have the policy activation date set as the same time you move in. (rentersinsurance.net)
Generally, these promotional cards have the same terms and conditions as any other gift card, however, they may have expiration dates (which will be clearly indicated and printed on the card), delayed activation dates or may be subject to additional restrictions or exemptions as stated on the promotion cards themselves or any packaging or other written materials that accompany the promotional cards. (bluelizard.net)
See the categories and activation dates below: (creditcards.com)