Nós vamos chegar daqui a duas horas.

Yes, it can often be omitted.

Portuguese is a pro-drop language, which means the subject pronoun is often left out when the verb already makes it clear who the subject is. So:

• Nós vamos chegar daqui a duas horas.
• Vamos chegar daqui a duas horas.

Both are correct.

Including nós can add clarity, emphasis, or contrast, especially if you want to stress we rather than someone else.

This is the very common ir + infinitive future structure:

• vamos chegar = literally we are going to arrive

In Brazilian Portuguese, this is extremely common in everyday speech and often sounds more natural than the simple future:

• Nós vamos chegar daqui a duas horas.
• Nós chegaremos daqui a duas horas.

Both are correct, but vamos chegar is more common in conversation.

Yes. Chegaremos daqui a duas horas is grammatically correct.

The difference is mostly about style and register:

• vamos chegar → very common, natural, conversational
• chegaremos → a bit more formal, written, or emphatic

In Brazil, learners will hear ir + infinitive all the time.

Daqui a is a very common way to say in when talking about time from now into the future.

So:

• daqui a duas horas = in two hours
• daqui a pouco = in a little while
• daqui a três dias = in three days

Literally, it has the idea of from here/now to a point in the future.

That a is part of the fixed time expression daqui a + amount of time.

You should learn it as a chunk:

• daqui a uma hora
• daqui a duas semanas
• daqui a um mês

This a is not the same as há.

A very important contrast:

• daqui a duas horas = in two hours from now
• há duas horas = two hours ago or for two hours, depending on context

They point in opposite time directions:

• daqui a duas horas → future: in two hours
• há duas horas → past: two hours ago / for two hours

Examples:

• Nós vamos sair daqui a duas horas. = We’re leaving in two hours.
• Nós chegamos há duas horas. = We arrived two hours ago.

This is a very common contrast for learners to master.

Because hora is a feminine noun in Portuguese:

• uma hora
• duas horas

The numbers one and two change for gender:

• masculine: um, dois
• feminine: uma, duas

Since horas is feminine plural, you use duas.

Yes, and in Brazilian Portuguese that is often even more natural in everyday speech.

Compare:

• Nós vamos chegar daqui a duas horas.
• A gente vai chegar daqui a duas horas.

Both mean we will arrive in two hours.

A key grammar point:

• nós takes 1st person plural verb forms: nós vamos
• a gente takes 3rd person singular verb forms: a gente vai

In spoken Brazilian Portuguese, a gente is extremely common.

They can sometimes be similar, but they are not always identical.

• daqui a duas horas clearly means two hours from now
• em duas horas can mean in two hours too, but it can also suggest within the span of two hours or after two hours, depending on context

For a beginner, daqui a duas horas is the safest and clearest choice when you mean from now.

Because after the conjugated verb vamos in the ir + infinitive future structure, the main verb stays in the infinitive:

• vamos chegar
• vou sair
• vai chover
• vamos estudar

So:

• vamos = conjugated form of ir
• chegar = infinitive of the main action

This is exactly like going to arrive in English.

Not always. In this sentence, there is no destination mentioned, so chegar appears by itself.

But when you say where someone arrives, Portuguese often uses a preposition, especially in Brazilian Portuguese:

• Chegamos em casa.
• Vamos chegar no aeroporto às 8.

In more formal grammar, you may also see a with certain destinations:

• chegar ao aeroporto

But in everyday Brazilian Portuguese, chegar em is very common.

A natural Brazilian pronunciation would sound roughly like:

NÓS VA-mu(s) she-GAR da-KI a DOO-as Ó-ras

A few helpful notes:

• vamos is often pronounced more like vamu(s) in casual speech
• chegar has a sh sound at the beginning: shegar
• r at the end of chegar is often softer in Brazilian Portuguese, and in casual speech it may sound reduced

The exact pronunciation varies by region, but that will get you close.