Bindingsperioden er lang.

Because Danish normally writes compound nouns as a single word.

Here, bindingsperioden is built from:

• binding = commitment / lock-in
• s = a linking sound often used inside compounds
• periode = period
• -n = the definite ending

So the basic noun is bindingsperiode = commitment period / lock-in period, and bindingsperioden = the commitment period.

This is very normal in Danish. Where English often uses two words, Danish often uses one compound word instead.

Because Danish often puts the definite article at the end of the noun instead of using a separate word before it.

Compare:

• en bindingsperiode = a commitment period
• bindingsperioden = the commitment period

So in this sentence, the is built into bindingsperioden.

Er means is / are / am, depending on context. It is the present tense of at være = to be.

Examples:

• jeg er = I am
• du er = you are
• han er = he is
• bindingsperioden er lang = the commitment period is long

Unlike English, Danish does not change the present form of to be by person. It stays er.

Because adjectives in Danish change form depending on gender and number, and here the subject is singular common gender.

Bindingsperiode is a common-gender noun, so the predicate adjective is:

• lang for common gender singular

Compare:

• Bindingsperioden er lang. = common gender singular
• Huset er langt. = neuter singular
• Bindingsperioderne er lange. = plural

So lang is the correct form here.

The sentence has the normal Danish main-clause order:

subject + verb + complement

So:

• Bindingsperioden = subject
• er = verb
• lang = complement

This looks very similar to English here:

• The commitment period is long.

More generally, Danish is a V2 language, which means the finite verb usually comes in the second position in main clauses.

For example:

• Ofte er bindingsperioden lang. = Often, the commitment period is long.

Even when another element comes first, the verb still stays in second position.

Then Danish usually uses a separate definite word before the noun, and the noun itself goes back to its basic form.

For example:

• den lange bindingsperiode = the long commitment period

Notice the pattern:

• den = definite word
• lange = adjective form used here
• bindingsperiode = noun in its basic form, not bindingsperioden

So:

• bindingsperioden = the commitment period
• den lange bindingsperiode = the long commitment period

This is a very common pattern in Danish.

Not always.

Lang is the adjective long, as in:

• en lang periode = a long period

But English long can also be an adverb, and Danish usually uses længe for that:

• Jeg ventede længe. = I waited a long time.

Also, English long is not used for tall people, and Danish is the same:

• han er høj = he is tall
• not han er lang

So in Bindingsperioden er lang, lang is exactly the normal adjective meaning long.