Если код подтверждения не придёт в течение минуты, я перезвоню в банк.

Because the sentence begins with an если clause: Если код подтверждения не придёт в течение минуты. In Russian, when a subordinate clause comes before the main clause, it is separated by a comma.

So the structure is:

• Если ... , я ...
• If ... , I ...

This is very standard in Russian.

Russian often uses verbs of movement metaphorically for messages, emails, notifications, calls, and codes.

So код подтверждения придёт means something like:

• the confirmation code will arrive
• the confirmation code will come through

This is a very natural way to say it in Russian. You can also hear similar expressions like:

• Сообщение не пришло — The message didn’t arrive / come through
• Письмо пришло — The email/letter arrived

Because the sentence is talking about one future event, not a habitual action.

• не приходит = doesn’t come / isn’t coming in a present or repeated sense
• не придёт = will not come / won’t arrive

Here the speaker means: if the code does not arrive within the next minute, then they will call again.

Also, прийти is a perfective verb, and perfective verbs in Russian do not have a present tense. Their present-looking forms actually refer to the future:

• приду = I will come
• придёт = it/he/she will come

This is an important difference between English and Russian.

In Russian, after если, you can use the future tense when you are talking about a real future possibility:

• Если код не придёт, я перезвоню.

Literally, both parts are future:

• if the code will not arrive
• I will call back

But this is completely normal Russian. English uses the present form after if, while Russian commonly uses the future.

В течение is a fixed expression meaning during or within the course of.

So:

• в течение минуты = within a minute / during one minute

This expression takes the genitive case, so минута becomes минуты.

Why not в течении?

• в течение with -е is the fixed prepositional phrase meaning during
• в течении with -и would normally refer to the noun течение in a literal meaning like in the current/flow, which is not what we want here

So here only в течение минуты is correct.

They are not the same.

• в течение минуты = within a minute, meaning at some point during the next minute
• через минуту = in a minute, meaning after one minute has passed

Compare:

• Если код не придёт в течение минуты...
  = If the code doesn’t arrive within the next minute...

• Код придёт через минуту.
  = The code will arrive in a minute.

So в течение минуты emphasizes a time limit or time window.

Because Russian often expresses noun + of noun relationships by putting the second noun in the genitive.

So:

• код = code
• подтверждение = confirmation
• код подтверждения = confirmation code literally code of confirmation

This is a very common pattern in Russian:

• чашка чая = cup of tea
• центр города = city center, literally center of the city
• номер телефона = phone number, literally number of the phone

Перезвонить means to call back, to call again, or to ring back.

The prefix пере- here adds the idea of repeating the call or making another call after a previous one.

So:

• позвоню в банк = I’ll call the bank
• перезвоню в банк = I’ll call the bank back / I’ll call the bank again

In this sentence, the speaker is probably already in contact with the bank or has called before, so перезвоню is very natural.

Good question. With people, Russian usually uses the dative:

• позвонить маме
• позвонить другу

But with organizations, places, services, institutions, Russian very often uses:

• звонить в + accusative

So:

• звонить в банк
• звонить в офис
• звонить в полицию

This is especially common when the call is directed to an institution rather than a specific person.

So:

• я перезвоню в банк = I’ll call the bank back

Yes. Russian word order is flexible, although the original version sounds very natural.

Original:

• Если код подтверждения не придёт в течение минуты, я перезвоню в банк.

You could also say:

• Я перезвоню в банк, если код подтверждения не придёт в течение минуты.

Both mean the same thing. The difference is mainly in emphasis:

• starting with Если... foregrounds the condition
• starting with Я перезвоню... foregrounds the action the speaker will take

Yes, partly. Russian has no articles, so код подтверждения can mean:

• a confirmation code
• the confirmation code

The exact meaning depends on context. In this sentence, it is understood as the specific code the speaker is waiting for, even though Russian does not use a word like the.

Yes, a little.

In normal speech:

• что often sounds more like што, though that does not apply here
• его can sound like ево, also not here
• in придёт, the letter ё is important because it shows the stress: pri-DYOT

So:

• придёт = stressed on the last syllable
• it should not be pronounced like придет with unclear stress

In many printed texts, ё is often written as е, so you may see придет, but it still means придёт and is pronounced the same way.

Not naturally in this context.

Не будет means will not be, but for messages, calls, emails, and codes, Russian usually prefers verbs like:

• придёт — will arrive / come through
• поступит — will be received / come in
• отправят — they will send

So Если код подтверждения не придёт... sounds much more idiomatic than не будет.

This sentence is a very useful model:

• Если + future perfective, future perfective

Pattern:

• Если [something happens / doesn’t happen], [I will do something].

For example:

• Если он не ответит, я напишу ему ещё раз.
  If he doesn’t answer, I’ll write to him again.
• Если письмо не придёт сегодня, мы подождём до завтра.
  If the letter doesn’t arrive today, we’ll wait until tomorrow.

So this sentence is a great example of:

1. a conditional clause with если
2. future meaning in both clauses
3. a time-limit expression with в течение
4. an idiomatic verb of arrival, прийти, for a code/message