Can't help you on that one. I know the renewal window usually begins 30 days before the current pass expires so it may be the same here. Hopefully Cheshire Figment will see this and know for certain. Welcome to the increasingly paperless world! They will give you a confirmation number. Wise to jot that down somewhere that it won't be lost. But the information should be stored in Disney's computers indefinitely, until the passes are activated. Vouchers are just one more thing to keep track of / misplace / lose.