If he retires he'll need it. You aren't going to get as big a pension as your fellow government workers who put in fulltime hours and work their way into better paying positions. What your Swiss professor friend does has no impact on what I get or what you get. If you think working the bare minimum will get you a pension you can live on you will be in for a rude awakening. And then you can rail about how unfair the system is.well obviously my pension is better than private sector.
in case you forgot you said my friend needs every penny of his swiss pension and i responded hes a university professor