Even though I'm natively Swedish, I'm seriously unsure if it's "1,1 timme" or "1,1 timmar". That is, what in English would be "1.1 hour" or "1.1 hours".
Even as I'm typing this, I'm unsure if it's "hour" or "hours" when it's neither exactly 1 or over 1.
I've struggled with this in both English and my native language all my life. I don't know what it is. This particular piece of information is either never clearly explained, ambiguous, or it doesn't stick in my brain for whatever reason.
Is there a clear, authoritative, free online resource where this is clearly laid out in a big table, per-language?
I frequently have similar concerns and wish I could "look up" things which just aren't words in dictionaries. Basically, "grammar rules". But the only things I can find are extremely massive and impossible-to-digest computer files from "ICU" or similar organizations, where I would spend countless hours trying to interpret their data format which seems to be intended for computer programs/parsers rather than human beings.