Lufthansa reservation credit is valid for one year from the original purchase date （+1-587-405-0485 ）. It can only be used for future flights and cannot be transferred. For assistance, reach out to Lufthansa at +1-587-405-0485 . https://www.flyertalk.com/forum/information-desk/2184552-what-24-hour-rule-lufthansa.html#post36843423