Do Marriott free night certificates expire?

Related questions

1. How many points do I need for a free night at Marriott?
2. How many points do I need for a free night at Holiday Inn?
3. How do I redeem my IHG Rewards night?
4. Do IHG points expire?
5. What can IHG Rewards points be used for?
6. Can I convert IHG points to airmiles?
7. Can I use IHG points to book a room for someone else?
8. Can you transfer IHG points to Delta?
9. Can you cancel IHG free night?
10. Do Marriott Rewards points expire?

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15. #issued