Almost. Ett dygn can, rightly, mean any 24-hour period.
En dag is however a bit fuzzy in its meaning. Mostly, it refers to the daylight portion of the day or the waking part of it. But when speaking about events in the recent past or near future, dagar is also used.
Du måste vänta två dagar = You have to wait two days
Det var tre dagar sedan = That was three days ago
English is my native tongue, but I studied German, and now I am studying Swedish, as my father was Swedish. But i can not study German and Swedish at the same time, as I cannot keep them straight.
How can you keep all the languages in your mind straight_`? and retain them? do you speak all of them, or just able to read? I have no one here to speak with(Texas)and have tried to listen to the Swedish radio or tv, but I am not really an audio person, and I cannot listen fast enough. If you have any tips, please help an old Swede!
I like to rotate between languages. I would never try to learn two similar languages at the same time, at least not at an early stage.
If you don't like to listen, maybe you could try the opposite? I spoke to a German guy once who had married a Swedish girl and ended up unemployed for some time in Sweden with a lot of time on his hands. They were airing some German soap operas at that time, and he claimed to have learned most of his Swedish from reading the Swedish subtitles to those. Maybe you could watch some favorite TV show of yours with Swedish subtitles? (just remember to make allowances, there are bound to be some mistranslations too).
I believe a lot in exposure. Whatever you're interested in, try to find Swedish blogs/youtube channels/articles about it, since knowing and being interested in the subject will make it easier. Many of our students recommend the site 8sidor.se. There are also videos in easy Swedish on ur.se. Use search terms like "på lätt svenska" and "svenska för invandrare".
On Duo, practice a lot and don't be afraid to make mistakes. Try to make it easy on yourself, but spend a lot of time on it, those are my tips.
Oh and since you have Swedish roots, why not try some ancestry research? If you find some distant relatives in Sweden, they might be overjoyed to hear from you. Everybody is different of course but a lot of people think it is super cool to have American relatives :)
I too have more familiarity with German, and one some days found Swedish confusingly close. At first I wouldn't go from one right to the other--I would do German in the morning and Swedish in the afternoon. But then I experienced a kind of "gear-shift," and the confusion is mostly not there. It's true that there are some misleading words--"springen" and "springa" do not mean the same thing--but we have those with English, too--"räven" is not Poe's bird. I wanted to make the next-to-last vowel in "författare" and "lärare" an "e", to correspond to the German "Verfasser" and "Lehrer," but then I discovered that there's a whole lot of Swedish nouns that end in -are. Mostly the cognates are helpful--the one I found most recently was Held/hjälte. I'm taking a long time to say "Keep at it. It gets easier." I've found that doing a little bit every day helps a lot, even if it's just the strengthening exercises. (Hmmm. Maybe Mom was right...)
I must say, I'm finding my knowledge of German, imperfect though it is, VERY helpful in learning Swedish. So many Swedish words are similar enough to their German cognates to be recognisable, but different enough to be easily kept apart. I haven't tried conversing in Swedish yet, but I'm pretty sure I wouldn't often fall into the trap of mixing it up with German (as when I try to speak Spanish I always mix it up with Italian).
Because you don't use the continuous forms ("is ...ing") for statements about things that are generally or universally true. "I am living in Rostock" - "No, you're not living in Rostock: you LIVE in Rostock, you ARE LIVING in Aberdeen" - that is typical of the kind of conversation I regularly had with overseas advisees in my teaching days.