This wikipedia page describes and compares CEFR with National levels
https://en.wikipedia.org/wiki/Common_Eu ... ral_scales
It also gives estimates for no. of hours study needed to reach a level in German and French.
Swedish is in many aspects more easy as far as the basics are concerned. So estimates could be less.
In any language, any, the specificsn exceptions, idioms, speaking habits vs official writing... are all equally difficult, I would suppose.