Reklamationsretten gælder i to år.

Danish, like German, often forms compound nouns by writing several words together as one.

So:

• reklamation = complaint / claim
• ret = right
• reklamationsret = the right to make a complaint or claim
• reklamationsretten = the right to make a complaint or claim

The extra s in reklamationsret is a linking s, which often appears in compounds.

The -en is the definite article attached to the noun. In Danish, instead of putting the before many nouns, you usually add it to the end.

So:

• en reklamationsret = a right of complaint / a warranty claim right
• reklamationsretten = the right of complaint

This is very common in Danish:

• en bil = a car
• bilen = the car

Gælder is the present tense of at gælde, which means to be valid, to apply, or to be in force.

In this sentence, Danish uses the present tense just like English often does in general statements:

• Reklamationsretten gælder i to år.
• The right to complain applies/is valid for two years.

Other forms are:

• at gælde = to apply / to be valid
• gælder = applies / is valid
• gjaldt = applied / was valid

Because this is a normal main clause in Danish, and Danish usually follows a Verb-Second (V2) pattern. That means the finite verb tends to come in the second position.

Here the structure is:

• Reklamationsretten = subject
• gælder = verb
• i to år = time expression

So the sentence order is perfectly standard:

Subject + verb + time phrase

I to år means for two years in this context.

Danish often uses i to express a duration of time:

• i to dage = for two days
• i en uge = for a week
• i to år = for two years

So although English uses for, Danish uses i here.

Because Danish normally uses i for duration, where English often uses for.

Compare:

• Det gælder i to år. = It is valid for two years.
• Jeg boede der i tre måneder. = I lived there for three months.

Using for here would sound wrong in standard Danish.

Because after a number, Danish normally uses the noun without an article.

So:

• to år = two years
• tre dage = three days
• en måned = one month

You do not say something like the two years unless you specifically mean those particular two years in another context.

It is plural in meaning, even though the form looks unchanged.

The noun år is one of those Danish nouns whose singular and plural can look the same:

• et år = a year
• to år = two years

So the number to tells you it is plural.

A rough English-friendly guide is:

• gælder ≈ GEL-der, but with a Danish vowel that is not exactly like English e

A few points:

• æ is a front vowel, somewhat like the vowel in cat, but not identical
• the d in -lder is often softer than an English d
• the word is usually said smoothly, not with heavy stress on both syllables

If you are aiming for a learner-friendly pronunciation, GEL-der is a decent starting point.

Not naturally in this meaning. Danish prefers gælder here because the idea is is valid / applies.

So:

• Reklamationsretten gælder i to år. = natural
• Reklamationsretten er i to år. = unnatural in this context

Use at være (to be) for identity or description, but at gælde for rules, rights, offers, tickets, warranties, and similar things that apply or are valid.

Yes, very much so. This is the kind of practical Danish you often see in:

• store policies
• receipts
• warranty information
• consumer rights texts
• product terms and conditions

The style is clear and neutral, and gælde is a very common verb in this kind of formal everyday language.

Yes. A few natural alternatives are:

• Der er to års reklamationsret. = There is a two-year right to complain.
• Du har to års reklamationsret. = You have a two-year right to complain.
• Reklamationsretten gælder i 2 år. = same sentence, just using the numeral 2

These all express roughly the same idea, but the original sentence sounds especially neutral and informational.