In Norway the office is desolate after 13:00 on a Friday. Only the youngest and the ones without children stick around till 16:00, and not many of them either.
As another Nordic, I've seen people gladly leave the office around 15:00 or 16:00 (or earlier for some people if they like to start early) on a Friday, but it's hard to imagine people who are on the clock regularly leaving at 13:00 unless they are real early birds.
I was just always amazed how quiet the office was on Friday afternoons during the years when I went back to working in Norway. Great for me as I got lots done during those hours. Or perhaps not great as I did not have a cabin to travel to...
Anecdotally having a Friday beer o'clock in the office does not work in Norway. Partly as they frown upon drinking at work... and also there is no-one left in the office.