How much time do you need to change trains?

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We are going from Vienna to Paris via Munich where we pick up the overnight train.  One option has 13 minutes to change trains and the other I can find has 2.5 hours? My husband has issues about missing trains, planes, etc. But I would prefer not to sit in the train station for 2.5 hours.
Is Munich a city where you could leave the train station & go to Hof Brau house or similar at 9pm?
Also found a train that goes from Vienna to Salzburg w/10 min train change to Munich giving 30 min train change to Paris. Feasable or Fearful?

Well, we would say that 13 minutes is enough to change trains in Munich, especially if you already know where to go (http://www.nshispeed.nl/web/file?uuid=5c639fa8-290f-4d43-985b-0cb27321a59e&owner=9b297389-b7eb-44ef-9921-53cca90f5c58&contentid=2171), train RJ 68 arrives from Vienna platform 11, CNL train to Paris departs from platform 22. As you can see on the map distance between those two isn't big, at least easy to cover under 5 minutes.
10 min. change in Salzburg also not a problem, the train station there is much smaller, so even 3 minutes will be enough there.
But you can always enjoy a short stay in Munich as well, there are plenty of places to spend 30min.-2.5 hours at the station and nearby, almost all of them work till midnight or even longer.