We have a HKG to MIA flight on Lufthansa (LH797 to FRA) with a 3+ hour stopover in Frankfurt Terminal 1. I'm thinking of buying access to the Lounge after the 14 hour flight so we have somewhere to clean up and eat before our next 10+ hour flight (LH462) to Miami. We can only buy access to the Lufthansa Bistro Lounge at Gate C14/15, but I believe the FRA to MIA flights departs at one of the Z Gates.

How long does it take to get to the Z gates from the Lufthansa Bistro Lounge at Gate C14/15? I believe there is security that we need to go through to get from the C Gate terminal to the Z Gate terminal.. If anyone has any experience doing this, your feedback would be greatly appreciated.