Enter Berlin, transit in Frankfurt for 3 and a half hours, will it be enough ?
4 Answers
If the two flights are operated by the same airline, the issue is that the airline will wait for the connecting flight.
The Tagore Airport is very simple and rudimentary, after passing through customs, you go directly to the baggage carousel. And if your luggage goes directly, you don't need to pick it up. As for buying things, there's not much there.
3.5 hours is enough. There is no refund for pre-authorization itself. Did you pay the car rental fee on site? If so, it should have been recorded at the time.
If the flight to Berlin is on time, there should be no problem.