While it is worrying that it takes so long, and its hard to shake that it is a somewhat serious happening.
To keep in mind a little how nordics work, we laothe work, and by that i mean, whne we have public holidays, we do not only have those days off.
Springtime in nordics is dotted spread out with tonnes of days just in the middle of weeks one day off here, another day off there etc. combine that with that we have several weeks of vacation given to us that cannot be denied if asked for unless a specific clear business critical reason. (gotta love basic human worker rights insert jokes here).
Anyways this effectivly means that while there might be say, 8 "public holidays" in a given period, if 1 of those happens on a wednesday, a large majority of people are more often then not, also going to spen 2days out of their several weeks vacation, to get a nice mega weekend. and this will inevitably happen with every week, every day and "Squeeze days" as we simply call them where taking 1-2 days off, gets you nearly a "week" off work.
of course it has to rotate not everyone can just throw the papers into the air and go on holiday, but it means that from about mid/early march to about mid May in the land of the nords, we tend to just have half the workforce present due to that.
from mid june to late august, its summer time where many companies enforce you _have_ to take 3 weeks combined off work, though less enforced nowadays its still highly encouraged that you do, meaning that overall.
from mid march to late august, companies may have half the work force present, and while grocery stores, and what not, and some service related companies heavily rely on youth, teens and what not working simple jobs for a few hours to make some easy money in his period more than normal, banking and money transfers is not exaclty a job you'd hand over to a 15 year old xD
I honestly feel that at least during springtime, this is likely as much of a logical reason i can think of being a nordic myself, looking at a "nice long weekend" next week having nearly a week off work, for simply using 1 vacation day, or in april when my co workers used 3 days each, to get nearly 2 weeks total of work
Still sucks though because I placed mine in mid april, and due to the above simple nordic logic of how vacation work i hope that whomever does finance has not taken vacation days off much. If not i wont see shite untill august i suspect ...