How much time would it take a transfer between Terminal 2, D-area/pier, non-Schengen EU arrival and Terminal 1 (Condor gates?), departure to non-Schengen, non-EU destination, if I use the FRA airport "gate-to-gate" paid transfer service? I have exactly 60 minutes layover time, one ticket (Condor). They say the minimum transfer time is 45 minutes. Do they have some fast tracks through security checks, immigration, etc?
Each major airport has shortcuts, which can be used by staff. These shortcuts are used by the airline staff if some transit passengers are late but should be brought to the departure on time. This includes separate passport control and separate security check.
However, if you have the single ticket, you should not worry about layover. In case you previous flight is late, the airline will give you free tickets for the next flight.