Lukkertiden er kort.

Because Norwegian normally writes compound nouns as a single word.

Here, lukkertid is one compound noun, and then -en is added to make it definite:

• lukkertid = closing time
• lukkertiden = the closing time

This is very common in Norwegian. Where English often uses two words, Norwegian often uses one.

The -en is the definite article attached to the noun. In Norwegian, the is often added to the end of the noun instead of appearing as a separate word in front.

So:

• en lukkertid = a closing time
• lukkertiden = the closing time

This is one of the biggest differences from English noun structure.

Yes. The indefinite singular form is en lukkertid.

So the sentence could theoretically be changed like this:

• En lukkertid er kort.

But that would sound less natural in many contexts, because lukkertiden usually refers to a specific, known closing time.

Because Norwegian usually expresses definiteness by adding an ending to the noun itself.

So instead of something like the lukkertid, Norwegian says:

• lukkertiden

If you add an adjective before the noun, then Norwegian often uses both a separate definite marker and the noun ending:

• den korte lukkertiden = the short closing time

That double marking is normal in Norwegian.

Er is the present tense of å være = to be.

So:

• jeg er = I am
• du er = you are
• han/hun er = he/she is
• lukkertiden er = the closing time is

It is the same form for all persons in the present tense.

Here kort is a predicate adjective, meaning it comes after er and describes the subject.

In Norwegian, predicate adjectives often agree with the noun in number, and sometimes in gender. But with kort, the singular form is still kort.

Compare:

• Tiden er kort. = The time is short.
• Dagene er korte. = The days are short.

So in this sentence, singular kort is correct.

Yes, but only in some contexts.

Typical forms are:

• kort = singular
• korte = plural or after many definite/plural adjective uses

Examples:

• en kort dag = a short day
• et kort svar = a short answer
• korte dager = short days
• dagene er korte = the days are short

With kort, you do not see an extra -t appear because the word already ends in t.

Possibly, yes, in Bokmål, depending on whether you use feminine noun forms.

The noun tid can often be treated as either common gender or feminine in Bokmål, so you may see:

• lukkertiden
• lukkertida

Both can be acceptable, depending on style and dialect preference. If you are unsure, lukkertiden is a very safe standard Bokmål choice.

This is the normal Norwegian word order for a simple statement:

• Subject + verb + adjective/complement
• Lukkertiden er kort.

That matches basic English order quite closely.

A useful thing to remember is that Norwegian is a verb-second language, so in main clauses the finite verb normally comes early. In this sentence, the subject comes first, so the verb naturally comes second.

You usually make a yes/no question by putting the verb first:

• Er lukkertiden kort? = Is the closing time short?

So the change is:

• statement: Lukkertiden er kort.
• question: Er lukkertiden kort?

That verb-subject inversion is very common in Norwegian.

You put ikke after the verb:

• Lukkertiden er ikke kort. = The closing time is not short.

This is the usual position for ikke in a simple main clause like this:

• subject + verb + ikke + rest

Usually yes. Because it is in the definite form, it normally refers to a specific closing time that is already known from the context.

So lukkertiden er kort sounds like you and the listener already know which closing time is being discussed.

If you wanted something more general, Norwegian might use a different structure depending on context.