Technically, negative half an hour.
I managed to make my connecting flight and got home in time. So: more time in one airport; less time in another; and missing the flight was itself caused by extra time spent waiting on/for trains, so it all balances out.
(My baggage didn't make the connecting flight, and it took longer to get that sorted out than it would have done to just pick it up, so this wasn't quite costless. Also the airport time was spent with more talking-to-people and less relaxing than it would have done otherwise. And I minorly inconvenienced lots of other people while rushing for my connection. But really, the whole thing was a lot less of a hassle than I'd have expected.)
For what it's worth, this is quite different from any of my experiences missing a flight, which for me have always resulted in at least a couple hours of additional delay, and on some occasions over six. For my sister, on two occasions it has resulted in delays over twelve hours.
Nearly all of these were due not to a deliberate attempt to arrive at the airport as late as I could get away with though (in general I do not try to do this unless the alternative is getting up unconscionably early, because of my experiences regarding the unpredictability of airp...
This is the public group instrumental rationality diary for October 16-31.
The poll earlier this month seems to be sufficiently in favor of maintaining the current schedule that extra votes are unlikely to change things much, but if you'd really like to register your opinion, you are welcome to do so here.
Thanks to cata for starting the Group Rationality Diary posts, and to commenters for participating.
Immediate past diary: October 1-15
Next diary: November 1-15
Rationality diaries archive