Award miles are usually valid for 36 months. They expire if they are not redeemed within this period. However, there is a simple way to retain your miles despite this.
Normally your award miles in the Miles & More program expire after 36 months, however, they are valid for longer if you have SWISS Miles & More credit cards and the following Terms and Conditions are met:
1) Except for fees, interest, back-charges, outstanding payments, cash withdrawals and spending on the lottery, betting or casinos.