What is the 24 hour rule for Lufthansa Airlines?

What is the 24 hour rule for Lufthansa Airlines?
What is the 24 hour rule for Lufthansa Airlines?
What is the 24 hour rule for Lufthansa Airlines?
What is the 24 hour rule for Lufthansa Airlines?
What is the 24 hour rule for Lufthansa Airlines?
What is the 24 hour rule for Lufthansa Airlines?
What is the 24 hour rule for Lufthansa Airlines?