Hon tycker att vardagarna är långa, så hon vill slappna av på kvällen.

In Swedish, these are three different patterns:

• tycker att + clause
  Used to express an opinion about a whole statement.

  • Hon tycker att vardagarna är långa.
    = She thinks / finds that the weekdays are long.

• tycker om + noun / verb
  Means to like something.

  • Hon tycker om vardagarna.
    = She likes weekdays. (The opposite feeling of the original sentence!)

• tycker + adjective/adverb (without att)
  Often needs an object or context, and is less common in this exact sense. You might see:

  • Hon tycker så här: …
  • Vad tycker du? = What do you think?

In this sentence, she is expressing her opinion about a full statement (vardagarna är långa), so tycker att is needed.

Here att is a subordinating conjunction meaning that in English.

• Main clause: Hon tycker (She thinks)
• Subordinate clause: att vardagarna är långa (that the weekdays are long)

So the structure is:

[Hon tycker] [att vardagarna är långa].

You generally must include att when introducing a statement like this:

• Hon tror att det ska regna. = She thinks/believes that it will rain.
• Jag vet att han kommer. = I know that he is coming.

Leaving out att is possible in some dialects or very informal speech but is not standard written Swedish.

Vardagarna is the definite plural: the weekdays.

• en vardag = a weekday
• vardagen = the weekday
• vardagar = weekdays
• vardagarna = the weekdays

Swedish often uses the definite plural when talking about a group in a fairly general but still “known” or “typical” sense – like the weekdays in her life / in a normal week.

You could say:

• Vardagar är långa. = Weekdays are long.

This sounds a bit more like a general statement about weekdays as a concept.
Vardagarna är långa sounds more like the actual weekdays she experiences feel long to her. Both are grammatically correct; it’s a nuance of style and focus.

Adjectives in Swedish agree with the number and definiteness of the noun.

• en vardag är lång – singular, common gender → lång
• två vardagar är långa – plural → långa
• vardagarna är långa – definite plural → långa

So:

• vardagarna (plural)
  → adjective must take -a: långa.

If it were singular:

• Vardagen är lång. = The weekday is long.

In this sentence, så is a conjunction meaning so / therefore, and it starts a new main clause:

• Clause 1: Hon tycker att vardagarna är långa,
• Clause 2: så hon vill slappna av på kvällen.

Swedish often puts a comma between two independent main clauses when they are connected by men, för, så, etc.:

• Jag är trött, så jag går hem.
• Hon vill gå ut, men det regnar.

Note: så can also be an adverb meaning so / such, in which case you normally don’t have a comma before it:

• Det är så långt. = It is so far.
  Here så is not connecting two clauses, so no comma.

Slappna av is a phrasal (particle) verb made of:

• the verb slappna
• the particle av

Together they mean to relax.

In the sentence:

• vill = wants (modal/auxiliary verb)
• slappna av = relax (infinitive)

So the pattern is:

[hjälpverb / modal] + [infinitive (verb + particle)]
Hon vill slappna av. = She wants to relax.

In some tenses, the verb and the particle can be split:

• Hon slappnar av på kvällen.
• Hon ska slappna av på kvällen.
• Hon vill gärna slappna av.

But you wouldn’t normally say hon vill slappna på kvällen av – the particle stays with the verb phrase as a unit.

All three relate to relaxing, but with slightly different nuances:

• slappna av – literally relax, often about your body or tension, but also general.

  • Hon vill slappna av efter jobbet.

• koppla av – also relax / unwind, sometimes with a nuance of disconnecting mentally from work or stress.

  • Jag kopplar av när jag läser böcker.

• ta det lugnt – take it easy, be calm, not do too much.

  • I helgen ska jag bara ta det lugnt.

In this sentence, slappna av is very natural, but koppla av would also fit:

• …, så hon vill koppla av på kvällen.

Swedish has fixed patterns for times of day:

• på morgonen – in the morning
• på dagen – in the daytime
• på kvällen – in the evening
• på natten – at night

Here, på kvällen with singular definite (kvällen) often means something like:

in the evenings / in the evening (as a typical time of day)

So Hon vill slappna av på kvällen can mean she wants to relax in the evening (typically / usually).

Other options and nuances:

• i kväll = this evening (specific, tonight)

  • Hon vill slappna av i kväll. = She wants to relax this evening.

• på kvällarna = in the evenings (repeated, more clearly habitual)

  • Hon vill slappna av på kvällarna. = She likes to relax in the evenings (as a habit).

So på kvällen can already imply a general, typical time of day without needing the plural.

This is a common Swedish pattern:

• på morgonen – in the morning(s)
• på eftermiddagen – in the afternoon(s)
• på kvällen – in the evening(s)
• på natten – at night

Even though it’s singular definite, it often refers to a typical or habitual time of day, not just one single evening.

So:

• Hon vill slappna av på kvällen.
  ≈ She wants to relax in the evening (as her usual time).

If you want to be extra clear about repetition, you can use the plural:

• på kvällarna = in the evenings (regularly)

But på kvällen already sounds quite natural for a general habit.

Yes, that is correct and very natural.

Swedish uses V2 word order in main clauses: the finite verb (here vill) tends to come in second position, no matter what comes first.

Two versions:

1. Neutral order:

   • Hon vill slappna av på kvällen.
     
     • 1st: Hon (subject)
     • 2nd: vill (verb)

2. With time expression first (for emphasis or style):

   • På kvällen vill hon slappna av.
     
     • 1st: På kvällen (adverbial)
     • 2nd: vill (verb)
     • Subject hon moves after the verb.

Both sentences mean the same thing; the second one puts a bit more emphasis on på kvällen.

Vardag specifically means weekday, i.e., a normal working day (usually Monday–Friday).

• en dag = a day (any day)
• en vardag = a weekday (not weekend or holiday)
• en helg = a weekend / holiday

So:

• vardagarna = the weekdays (Mon–Fri)
• dagarna = the days (could be any days, depending on context)

In this sentence, vardagarna tells us she finds weekdays long (probably workdays), not necessarily weekends.