Nikâhtan sonra eve dönmek için metrobüse bineceğiz; bu saatte metrobüs genelde çok kalabalık oluyor.

Nikâhtan sonra literally means after the wedding ceremony / after the marriage ceremony.

• nikâh = marriage ceremony, official wedding
• -tan = the ablative ending, often meaning from
• sonra = after

In Turkish, sonra often follows a noun in the ablative case:

• dersten sonra = after class
• işten sonra = after work
• nikâhtan sonra = after the wedding ceremony

So even though English uses after + noun, Turkish commonly uses noun + ablative + sonra.

Not exactly in every context.

nikâh usually refers to the official marriage ceremony itself, especially the formal/legal part. Depending on context, it may be translated as:

• wedding ceremony
• marriage ceremony
• civil ceremony

It does not always mean the entire celebration, party, reception, etc. So in this sentence, nikâhtan sonra most naturally suggests after the ceremony.

Because dönmek here means to return/go back to somewhere, and the destination takes the dative case.

• ev = home, house
• eve = to home / homeward

So:

• eve dönmek = to return home

This is very common in Turkish:

• okula gitmek = to go to school
• Ankara'ya dönmek = to return to Ankara
• eve gelmek = to come home

-mek / -mak için means in order to or for the purpose of doing something.

So:

• eve dönmek için = in order to return home

The structure is:

• verb stem + infinitive (-mek/-mak) + için

Examples:

• Türkçe öğrenmek için çalışıyorum. = I am studying in order to learn Turkish.
• Seni görmek için geldim. = I came to see you.

In your sentence, it explains the purpose of taking the metrobus: We will take the metrobus in order to go back home.

Because the verb binmek takes the dative case in Turkish.

So Turkish says:

• otobüse binmek = to get on the bus
• trene binmek = to board the train
• metrobüse binmek = to get on the metrobus

Even though English says get on the bus, Turkish uses a structure closer to board to the bus in terms of grammar, so the noun takes -e / -a.

That is why you see:

• metrobüs → metrobüse

bineceğiz means we will get on / we will take / we will ride.

It comes from:

• bin- = get on, board, ride
• -ecek / -acak = future tense
• -iz / -ğiz = we

So:

• bineceğiz = we will board / we will take

In this sentence, the most natural English translation is: we’ll take the metrobus

That is just the most natural English translation.

Turkish often uses binmek for getting on or riding forms of transport:

• otobüse bindim = I got on the bus / I took the bus
• bisiklete biniyor = he/she is riding a bicycle
• metroya bineceğiz = we will take the metro

So metrobüse bineceğiz is literally something like we will board the metrobus, but in normal English we’ll take the metrobus sounds better.

Yes, structurally it is very close to at this hour / at this time.

• bu = this
• saat = hour, time
• bu saatte = at this hour / at this time

The ending -te / -ta is the locative case, often meaning in, on, at.

So:

• bu saatte = at this time
• sabah saatlerinde = in the morning hours
• saat üçte = at three o’clock

In this sentence, bu saatte means at this time of day.

Both can work, but they are slightly different in feel.

• metrobüs genelde çok kalabalık = the metrobus is generally very crowded
• metrobüs genelde çok kalabalık oluyor = the metrobus generally tends to be very crowded / usually gets very crowded

Using oluyor here gives a more natural sense of a usual situation that happens regularly. It can sound a little more dynamic or observational.

Turkish often uses oluyor in statements about repeated real-life patterns:

• Buralar akşamları sakin oluyor. = This area is usually quiet in the evenings.
• Yazın hava çok sıcak oluyor. = In summer the weather is usually very hot.

So here it means: At this time, the metrobus is usually very crowded.

kalabalık means crowded or crowd-filled.

So:

• çok kalabalık = very crowded
• kalabalık oluyor = is crowded / becomes crowded / tends to be crowded

The exact English translation depends on context. In this sentence, is usually very crowded is the best natural choice.

genelde means generally / usually. In Turkish, adverbs like this are quite flexible, but they are often placed before the part they modify.

So:

• metrobüs genelde çok kalabalık oluyor = the metrobus is generally/usually very crowded

You may also hear similar word orders like:

• Metrobüs bu saatte genelde çok kalabalık oluyor.
• Bu saatte metrobüs çok kalabalık oluyor genelde.

But the version in your sentence is very natural and standard.

Because the first metrobüs is the one they will take, and the second metrobüs is the general topic of the next clause.

The sentence is:

• ...metrobüse bineceğiz
• bu saatte metrobüs genelde çok kalabalık oluyor

In English, we might avoid repetition more often: We’ll take the metrobus to get home; it’s usually very crowded at this time.

Turkish can also use pronouns less often than English, but repeating the noun here sounds clear and natural.

The semicolon links two closely related clauses:

1. Nikâhtan sonra eve dönmek için metrobüse bineceğiz
2. bu saatte metrobüs genelde çok kalabalık oluyor

The second part explains or comments on the first: they will take the metrobus, and the speaker adds that it is usually crowded at this hour.

A comma or a full stop could also appear in some contexts, but the semicolon nicely shows a strong connection between the two ideas.

It is mostly neutral everyday Turkish.

Nothing in it is especially slangy or highly formal. A native speaker could say this in normal conversation.

A few notes:

• nikâh is a normal word
• metrobüs is standard
• genelde is common in speech and writing
• the semicolon makes the punctuation look slightly more polished in writing, but the sentence itself is still natural and conversational

It can do either, depending on context.

• If people are speaking at, say, 6:30 p.m., bu saatte can mean at this time right now
• It can also mean at this time of day, more generally

In this sentence, because of genelde (usually), it most likely means: at this time of day

So the speaker is making a general observation: The metrobus is usually very crowded around this time.

A very literal translation would be:

After the marriage ceremony, in order to return home, we will board the metrobus; at this hour the metrobus usually is/becomes very crowded.

That sounds awkward in natural English, so a better natural translation would be:

After the wedding ceremony, we’ll take the metrobus to get home; it’s usually very crowded at this time.