Air Baltic, 40m for baggage drop-off, 30m for business class https://www.seatguru.com/airlines/Air_Baltic/checkin.php
Polish airlines, 30m (also note many different airports around Europe are listed under 30m) https://www.lot.com/ge/en/at-the-airport
Munich Airport, 45m with luggage, 35m without https://www.icelandair.com/support/airports/munich-muc/
Heathrow, the busiest in Europe, 45m for short haul flights, 35m cut-off for security. https://www.britishairways.com/en-us/information/airport-inf...
Alitalia, 40m from Rome Fiumicino https://www.alitalia.com/en_en/fly-alitalia/check-in/check-i...
And again, these don't matter to us if we have out boarding pass and only carry-on luggage. But it clearly demonstrates arriving 45 minutes before departure is hardly tight. And many airports and airlines don't consider 30 minutes crazy.
Sure; rail times were what I was assuming; your document puts them in the region of 40 minutes from a "hub" (though there's a lot of variation), so I stand by about an hour from a typical origin/destination. If you routinely take taxis then fair enough, but that comes with its own set of downsides.
> Boarding for short flights shouldn't close earlier than 20 minutes before departure. For large airports 40 mins should be enough. For tiny regional airports 30. Even check-in counters will sometimes close as late as 30 mins before departure.
I've never seen an airport that didn't officially advise 45 minutes, and every major airport I've been to had check-in counters closing an hour before departure. (Whereas, Eurostar excepted, the official number I've heard from train operators is 5 minutes). You can probably get away with less most of the time, sure, but I wouldn't want to take the risk.