The taxiway is very long in FRA. I m CC and i know in some airports such as BCN AMS .... the taxiway is around 8-10 min . around 20 min to join the gate and back to the runway. so 25 minus 20 = 5 minutes left to disembark, cleaning, boarding ...... JUST IMPOSSIBLE but maybe FR includes in the flight time the long taxiway in FRA