Det er tiden værd.

Word for word:

• Det = it/that
• er = is
• tiden = the time
• værd = worth

So the literal structure is close to It is the time worth, but the natural English meaning is It is worth the time or It’s worth your while.

It usually refers to a situation, activity, experience, or plan that is already clear from context.

So if someone is talking about reading a book, taking a course, visiting a museum, etc., det means it in the same broad English sense:

• Det er sjovt. = It is fun.
• Det er svært. = It is difficult.
• Det er tiden værd. = It is worth the time.

In other words, det does not have to point to a specific noun. It can refer to a whole idea.

Because det is the normal general it when you are commenting on a situation or idea.

Use den when you are referring back to a specific common-gender noun:

• Filmen er god. Den er tiden værd. = The film is good. It is worth the time.

Use det when the subject is more general or when no specific noun is being repeated:

• At se filmen? Det er tiden værd. = Watching the film? It is worth the time.

So in your sentence, det is the neutral, general subject.

Because tiden is the definite form, meaning the time.

In Danish, definiteness is often added as a suffix:

• tid = time
• tiden = the time

In this expression, Danish normally uses the definite form:

• Det er tiden værd.

Using just tid here would sound unnatural. Danish treats this as worth the time, not just worth time.

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

So:

• en tid = a time
• tiden = the time

That -en ending is doing the job that English the does.

Here værd functions like a predicate adjective after er.

It works similarly to English worth in sentences like:

• It is worth the effort
• It is worth the time

So in Det er tiden værd, værd describes the value of the situation: it is worth the time spent.

Because with værd, Danish commonly uses the pattern:

[noun phrase] + værd

For example:

• pengene værd = worth the money
• besværet værd = worth the trouble
• tiden værd = worth the time

So tiden værd is the normal and idiomatic order. You should learn it as a set pattern.

Usually no, not in this meaning.

Unlike many adjectives in Danish, værd normally stays værd in this kind of expression:

• Det er værd.
• De er det værd.
• Det er pengene værd.
• Det er tiden værd.

So learners can generally treat it as a fixed form here.

You can absolutely use other nouns too. This is a common pattern, not just one single frozen phrase.

Examples:

• Det er pengene værd. = It is worth the money.
• Det er besværet værd. = It is worth the trouble.
• Det er ventetiden værd. = It is worth the wait.
• Det er rejsen værd. = It is worth the trip.

So tiden værd is one member of a larger, very useful pattern.

They are closely related, but they are used differently.

• Det er tiden værd. = It is worth the time.
• Det er værd at læse bogen. = It is worth reading the book.

So:

• værd + noun phrase = worth the time / money / trouble
• værd at + infinitive = worth doing something

If you want to say exactly what action is worth doing, værd at + verb is often the better choice.

Yes. Det er det værd is the usual way to say It is worth it.

Compare:

• Det er tiden værd. = It is worth the time.
• Det er pengene værd. = It is worth the money.
• Det er det værd. = It is worth it.

In Det er det værd, the second det stands for whatever cost, effort, or sacrifice is understood from context.

You just change the verb or add ikke as usual:

• Det er ikke tiden værd. = It is not worth the time.
• Det var tiden værd. = It was worth the time.
• Det bliver tiden værd. = It will be worth the time.
• Har det været tiden værd? = Has it been worth the time?

The expression tiden værd itself stays the same.

It can be tricky for English speakers.

A rough learner-friendly approximation is something like vehrth, but not exactly.

Two main difficulties:

• æ is a vowel sound that does not match English perfectly.
• The d is soft in Danish, not a strong English d.

So avoid pronouncing it like a hard verd. A softer ending is better. If you are listening for it in native speech, it may sound more blurred than you expect.