Если мы выйдем сейчас, мы успеем вернуться домой засветло.

This is a very common question for English speakers.

In Russian, when you talk about a real future condition, you normally use the future in both clauses:

• Если мы выйдем сейчас, мы успеем...

Literally, that is closer to:

• If we leave/will leave now, we will manage...

But in natural English, we do not usually say if we will leave, so the translation uses the English pattern:

• If we leave now, we’ll have time / we’ll manage...

So this is a grammar difference between the two languages:

• English: present tense after if for future meaning
• Russian: future tense after если for future meaning

Выйдем is the perfective future of выйти.

Russian uses the perfective aspect here because the sentence refers to a single completed action: leaving now / setting out now.

Compare:

• Если мы выйдем сейчас... = If we leave now... / If we set out now...
• Если мы выходим сейчас... would sound wrong here, because выходим is present tense imperfective, not the normal form for this kind of future condition.

So выйдем is used because the speaker means:

• one concrete action,
• in the future,
• seen as a whole/completed event.

Here выйти means something like leave, head out, or set off.

Its basic meaning is to go out / to exit, but in context it often broadens to:

• leave now
• head out now
• set out now

So in this sentence, выйдем сейчас means:

• if we leave now
• if we head out now

It does not necessarily emphasize physically stepping outside in English, even though that idea is built into the Russian verb.

Успеть means to be in time, to manage to do something before it’s too late, or to have enough time to do something.

It is very commonly followed by an infinitive:

• успеть сделать = to manage to do
• успеть прийти = to make it in time to arrive
• успеть вернуться = to manage to get back in time

So:

• мы успеем вернуться домой засветло

means:

• we’ll manage to get back home before dark
• we’ll have time to return home while it’s still light

Because after успеть, Russian normally uses an infinitive to say manage to do something.

Structure:

• успеть + infinitive

Examples:

• успеть поесть = manage to eat
• успеть закончить = manage to finish
• успеть вернуться = manage to return

So успеем вернуться is a standard pattern.

This is an aspect question.

• вернуться = perfective
• возвращаться = imperfective

Here the speaker is talking about one complete return: getting back home successfully before dark. Because the return is viewed as a completed result, вернуться is the natural choice.

Compare:

• успеем вернуться = we’ll manage to return
• успеем возвращаться would not fit well here

After успеть, the perfective infinitive is very common when the focus is on completing the action.

Historically, yes, it is a reflexive ending, but in many verbs like вернуться, it is best to think of it as just part of the verb.

• вернуть = to return something
• вернуться = to return / come back

So:

• вернуть книгу = return a book
• вернуться домой = return home

In this sentence, вернуться does not mean return oneself in a literal English sense. It simply means come back / return.

Домой is the standard word for to home / homeward / home when there is movement toward home.

Russian distinguishes:

• дома = at home
• домой = home, to home

Examples:

• Я дома. = I’m at home.
• Я иду домой. = I’m going home.

So:

• вернуться домой = return home

This is the normal idiomatic choice. You usually do not say вернуться в дом unless you specifically mean go back into the house/building.

Засветло is an adverb meaning:

• before dark
• while it’s still light
• before nightfall

It’s a fixed, fairly common word, and it often appears with verbs of movement:

• вернуться засветло = return before dark
• добраться засветло = get there before dark

So in this sentence:

• вернуться домой засветло = get back home before dark

Yes, the word order can change.

Russian word order is flexible, and засветло can move depending on emphasis:

• Если мы выйдем сейчас, мы успеем вернуться домой засветло.
• Если мы выйдем сейчас, мы засветло успеем вернуться домой.
• Если мы выйдем сейчас, успеем вернуться домой засветло.

The original version sounds natural and neutral.

Putting засветло near the end makes it feel like the final important condition/result: before dark.

Because Russian separates the two parts of a complex sentence with a comma:

• Если мы выйдем сейчас, мы успеем вернуться домой засветло.

The first part is the if-clause:

• Если мы выйдем сейчас

The second part is the main clause:

• мы успеем вернуться домой засветло

In Russian, this comma is required.

Possibly, depending on the situation, but the nuance changes a little.

• выйти often emphasizes going out / leaving a place
• уйти often emphasizes going away / departing

So:

• Если мы выйдем сейчас... = If we head out now / leave now
• Если мы уйдём сейчас... = If we leave now / go away now

Both can be possible in some contexts, but выйдем feels very natural if the idea is let’s go out now from where we are.

Yes. In this sentence, both are good depending on style.

• мы успеем вернуться домой засветло can be understood as:
  • we’ll manage to get back home before dark
  • we’ll have time to get back home before dark

Manage to emphasizes success before a deadline.
Have time to sounds slightly more neutral.

Both capture the idea well.