Question: how long does it take for a cashier's check to expire?
Answer: Some say cashier's checks don't expire, while others claim a cashier's check is stale (out of date) after 60, 90, or 180 days. Cashier's checks are backed by the issuing bank and, theoretically, should be valid for as long as the bank is in operation, but some banks will put expiration dates on the checks themselves.