Simon,
If the knife was sent from Canada using their "surface mail" postage.....which it sounds like.....as airmail is very expensive there.....much more so than the U.S....then I would expect 4-6 weeks to Sweden.
I got my FFBM in the States and sent by air mail at a decent price....about $50....for a 5-6 day delivery to the U.K.....just got a DFCG from Canada and the same option was about $90.....so for $25 I went for surface mail. I expect to see it in 4-6 weeks or so allowing for customs over here.
I have waited 8 weeks+ on some items where customs were scratching their heads as to what category of goods to charge duty on.....
HTH's