I bought a photography 12 months prepaid card at amazon - not yet activated - and got a second 12 months redeem code with Canon cashback promotion.
1. Can I activate both redeem codes at the beginning so that I get 24 months? Or do I have to wait to the end of the first 12 months and renew my membership at the end of membership #1 with the second redeem code.
2. How long are such redeem codes valid for activation? Can I wait more than one year with activation?