Kiedy nie mam czasu, też wybieram musli, bo robi się je szybciej niż owsiankę.

In this sentence, kiedy is best understood as a general when/whenever.

It does not mean a single specific moment only. The idea is more like:

• whenever I don’t have time
• in situations when I’m short on time

If you wanted a clearer if, Polish would usually use jeśli. So:

• Kiedy nie mam czasu... = when/whenever I don’t have time
• Jeśli nie mam czasu... = if I don’t have time

Both can be natural in some contexts, but kiedy sounds very normal here for a repeated situation.

Because Polish often drops subject pronouns when the verb already shows who is doing the action.

Here:

• mam = I have
• wybieram = I choose

So ja is unnecessary unless you want extra emphasis or contrast.

For example:

• Nie mam czasu = I don’t have time
• Ja nie mam czasu = I don’t have time, with emphasis

This is very common in Polish.

Because after negation, Polish very often changes the direct object to the genitive.

Compare:

• Mam czas = I have time
• Nie mam czasu = I don’t have time

Here, czas changes to czasu.

This is a very common pattern with negated verbs:

• mam pieniądze → nie mam pieniędzy
• widzę dom → nie widzę domu

So nie mam czasu is the correct form.

Because wybieram is the imperfective present, and it fits a habitual or repeated action.

The sentence describes what the speaker generally does in a certain situation:

• when I don’t have time, I also choose muesli

So wybieram means something like I choose / I tend to choose / I go for.

By contrast, wybiorę is perfective and usually future-oriented:

• wybiorę = I will choose

That would sound more like a one-time future decision, not a general habit.

Też means also or too.

In this sentence, it shows that choosing muesli is something the speaker does as well.

Polish word order is flexible, but placement affects emphasis. Here:

• też wybieram musli

sounds natural and puts also close to the verb phrase.

You may also see też in other positions, depending on what is being emphasized, for example:

• Ja też wybieram musli = I also choose muesli
• Wybieram też musli = I also choose muesli / muesli too

So the sentence’s word order is normal and natural.

Because musli is an indeclinable borrowed noun in Polish.

That means its form usually stays the same, even when its grammatical role changes.

In this sentence, after wybieram, it functions as the object, but it still stays musli.

This is different from a regular Polish noun like owsianka, which does change:

• owsianka
• owsiankę

So even though musli is the object here, its form does not change.

Robi się is an impersonal reflexive construction.

It is often used when Polish wants to express something like:

• people do it
• you do it
• one does it
• it is done

So robi się does not mean that something literally makes itself. It is a very common Polish way to avoid naming the subject.

In this sentence, robi się je szybciej means something like:

• it is prepared faster
• you can make it faster
• people make it faster

All of those are close in sense.

Je is the object pronoun it here, and it refers to musli.

So instead of repeating musli, Polish uses je:

• robi się je = one makes/prepares it

This is similar to English avoiding repetition:

• I choose muesli because it is prepared faster

Even though musli was mentioned earlier, Polish still needs an object here with robić, so je is used.

Because this is the most natural word order here.

In Polish, się usually appears very early in the clause, often right after the verb or after the first stressed element. Then short pronouns like je often come after it.

So:

• robi się je

sounds normal and idiomatic.

Polish word order is flexible, but not every arrangement sounds equally natural. For a learner, robi się je is the pattern worth remembering.

Because szybciej is the comparative form of the adverb szybko.

• szybko = quickly
• szybciej = more quickly / faster

Since the sentence compares two ways of preparing food, Polish uses the comparative adverb:

• robi się je szybciej niż... = it is made faster than...

This is the normal way to compare actions in Polish.

Because owsiankę is the accusative form of owsianka, and here it is understood as the object of an omitted verb.

The full idea is roughly:

• robi się je szybciej niż robi się owsiankę

Since owsiankę is the object of robić, it stays in the accusative.

So:

• owsianka = basic dictionary form
• owsiankę = accusative singular

This is why the comparison uses niż owsiankę, not niż owsianka.