Matka kestää noin tunnin.

Yes. In Matka kestää noin tunnin, kestää is the finite verb: it lasts / it takes.

It happens to look the same as the basic dictionary form (the 1st infinitive). That is normal with some Finnish verbs. So here context tells you what it is:

• kestää = to last / to take (time) as a dictionary form
• matka kestää = the trip lasts / takes as a full clause

Because matka is a singular subject, the verb is in 3rd person singular present.

Here kestää means to last or to take (a certain amount of time).

So:

• Matka kestää noin tunnin. = The trip takes about an hour.

This verb is also used in other meanings, such as to endure or to withstand, so its exact meaning depends on context.

Because matka is the subject of the sentence, and subjects are normally in the nominative (the basic form).

So the structure is:

• Matka = subject, the trip / journey
• kestää = verb, lasts / takes
• noin tunnin = duration, about an hour

Because with kestää, the length of time is usually treated as the object of the verb. When that duration is seen as a complete whole, Finnish uses the total object form.

For a singular word like tunti, that form is:

• tunti → tunnin

So:

• Matka kestää tunnin. = The trip takes an hour.

If you used tunti here, it would sound ungrammatical.

A useful comparison:

• Matka kestää tunnin. = a complete duration of one hour
• Matka ei kestä tuntia. = in a negative sentence, the object becomes partitive

Functionally, it is the accusative / total object of the verb.

But in the singular, the accusative often has the same form as the genitive, so it looks like a genitive:

• tunti = basic form
• tunnin = genitive-looking form

In this sentence, many learners will see tunnin and think genitive, but its job in the sentence is really that of a total object.

Noin means about, approximately, or around.

So:

• tunnin = an hour
• noin tunnin = about an hour

If you remove noin, the sentence becomes more exact:

• Matka kestää tunnin. = The trip takes an hour.
• Matka kestää noin tunnin. = The trip takes about an hour.

Because Finnish has no articles.

So matka can mean:

• a trip
• the trip

The exact meaning comes from context, not from a separate word like a or the.

The same applies to tunnin:

• tunnin can correspond to an hour here, even though there is no separate word for an

The normal, neutral word order here is:

• Matka kestää noin tunnin.

That is the safest version for a learner.

Finnish word order is more flexible than English word order, but changing it usually adds emphasis or changes the information focus. So while other orders are possible in the right context, this sentence is the standard, natural way to say it.

A good beginner rule is:

• subject + verb + duration

Yes. Finnish often uses the present tense where English might use the future.

So Matka kestää noin tunnin can mean:

• The trip takes about an hour in general
• The trip will take about an hour if you are talking about a future trip and the context makes that clear

Finnish often relies on context instead of a separate future tense.

A simple guide:

• MAT-ka
• KES-tää
• noin
• TUN-nin

A few important points:

• Stress is on the first syllable of each word.
• ää is a long vowel, so kestää should not be rushed.
• nn in tunnin is a long consonant.
• oi in noin is a diphthong.

Finnish pronunciation is usually very regular, so once you know the sounds, the spelling is dependable.