How long is an iTunes gift card valid for?

Related questions

1. How do you activate an iTunes gift card?
2. Where can I buy an Apple gift card online?
3. What is a iTunes card?
4. What can I buy with an iTunes card?
5. How do I send an iTunes gift card?
6. How do I know if an iTunes gift card has been redeemed?
7. Can I buy Apple gift card online?
8. Can you turn an iTunes gift card into cash?
9. Can I transfer iTunes credit to another account?
10. Can I transfer iTunes credit to Paypal?

Tags

1. #certificates
2. #store
3. #account
4. #unused
5. #itunes
6. #later
7. #applied
8. #answer
9. #cards
10. #allowances
11. #portions
12. #expire
13. #years
14. #issuance
15. #activity