Если идти без спешки, до парка всего полчаса пешком.

Russian often uses the infinitive impersonally in general statements.

So Если идти без спешки literally means something like:

• If one goes without hurrying
• If you go at an unhurried pace

There is no stated subject because the sentence is meant generally, not about a specific person.

Идти usually refers to movement in one direction, a specific trip, or the process of going somewhere.

Here the sentence is about how long it takes to get to the park on a particular route, so идти is the natural choice.

• идти = to go, to be going, to walk in a particular direction
• ходить = to go habitually, to walk around, to go back and forth, or to be able/customarily to go somewhere

So this sentence is about the trip to the park, not a repeated habit.

Без спешки literally means without hurry or without rushing.

It is made of:

• без = without
• спешка = haste, hurry

Because без requires the genitive case, спешка becomes спешки.

In natural English, this phrase can be translated as:

• without hurrying
• at an easy pace
• without rushing

The preposition до takes the genitive case.

So:

• парк = park
• до парка = to the park / as far as the park

This construction is common when talking about distance, destination, or how long it takes to get somewhere.

Examples:

• до дома = to home / to the house
• до станции = to the station
• до парка = to the park

Russian often omits a verb when the meaning is obvious from context.

Here the full idea is something like:

• До парка идти всего полчаса пешком.
• It takes only half an hour to get to the park on foot.

In the original sentence, идти is understood and left out in the second clause because it is easy to infer.

This kind of omission is very natural in Russian, especially in everyday speech.

Here всего means only, just, or as little as.

It adds the idea that the amount of time is small.

So:

• до парка полчаса пешком = it’s half an hour on foot to the park
• до парка всего полчаса пешком = it’s only half an hour on foot to the park

It is a very common word in Russian for soft emphasis like only in English.

Полчаса is the normal fixed word for half an hour.

It comes from пол- + часа.

Important point: after пол-, Russian usually uses the genitive singular form of the noun:

• полчаса = half an hour
• полдня = half a day
• полгода = half a year

So полчасов is not correct here.

Половина часа is grammatically possible, but it sounds more literal and less natural in everyday time expressions. For duration, полчаса is the usual choice.

Пешком means on foot.

It is historically connected with the instrumental form and now functions as an adverbial expression meaning the means or manner of travel.

So:

• ехать = to go by transport
• пешком = on foot

In this sentence, пешком clarifies that the half hour is walking time.

Even though идти already suggests walking, пешком is still very natural because it explicitly contrasts this with going by car, bus, bicycle, and so on.

Russian word order is flexible, and the end of the sentence often carries important or clarifying information.

Placing пешком at the end makes it sound like:

• it’s only half an hour — on foot

This is natural because the speaker first gives the time and then specifies the mode of travel.

You could also hear other word orders, such as:

• До парка пешком всего полчаса.
• До парка всего пешком полчаса.

But the original version sounds smooth and idiomatic.

Yes. A very natural fuller version is:

• Если идти без спешки, до парка идти всего полчаса пешком.

You could also say:

• Если идти без спешки, до парка всего полчаса.

If the context already makes it clear that we are talking about walking, пешком may be omitted.

Russian often prefers the shorter version when the missing words are obvious.

Yes, grammatically it is if, but in English this sentence may sound more natural as something like:

• At an unhurried pace, it’s only half an hour to the park on foot.
• If you don’t rush, it’s only half an hour to the park on foot.

So the Russian is conditional in form, but the meaning can feel close to assuming you go at a normal easy pace.

Yes, very often.

For example:

• Если идти не спеша, до парка всего полчаса пешком.

Both mean roughly the same thing:

• без спешки = without hurry
• не спеша = not hurrying, unhurriedly

The version with без спешки uses a noun phrase, while не спеша is a more adverb-like expression. Both are natural.

It has two parts:

1. Если идти без спешки
   = conditional clause
   = If you go without hurrying

2. до парка всего полчаса пешком
   = main statement about time/distance
   = it’s only half an hour to the park on foot

So the sentence as a whole is built like this:

If + manner of going, then + travel time to destination.

That pattern is very common in Russian.