Heh. Funnily enough, My partner and I missed an FEX from Gesundbrunnen a couple of weeks ago (it's 3 stations from where we live). Because the transition time b/w S-bahn exit and FEX entry was 1 minute, clearly not enough time to find the correct platform and arrive there to board.

Of course, one guy was prepared and literally _ran_ to the FEX. We walked and then waited 30 mins for the next one to arrive. :)