Originally Posted by
bluefeli
. But I am just wondering what happens if let's say everything went smoothly but the outbound flight from FRA got stuck... say 12 hours.. What are my options? Can I go to the lounge inside (without passing through immigration) and pay a fee to rest/shower?
Stop worrying. 😁
Green is on time, yellow is delay less than 30 minutes.

But to answer your question, there are lounges in the area where you will be waiting. Unfortunately Lufthansa isn't selling access, at least according to their website (but also wouldn't hurt to ask), so only status or business/first is likely to get you access.