At least a stop at a major hub will take that time. Basically, you don't only have the time spent stopped at the station, but you also have long period of acceleration and deceleration - an ICE3 takes 3km to stop from full speed in normal conditions according to a quick google search. Also, trains usually have to move extremely slow (40 km/h) in the surrounding area of a station... and the larger the station, the more switches.