On nema nikakav razlog za žurbu, a ja trenutno nemam vremena za običan ručak.

They are the normal negative present-tense forms of imati (to have).

• imam → nemam = I do not have
• imaš → nemaš = you do not have
• ima → nema = he/she/it does not have

So standard Croatian uses nemam / nema / nemaš, not ne imam / ne ima.

Yes, and that is completely normal in Croatian.

Croatian regularly uses negative concord, which means several negative words can appear together in the same clause:

• On nema nikakav razlog
  = literally something like He doesn’t have any kind of reason

In English, we usually avoid this kind of structure in standard grammar, but in Croatian it is the standard pattern.

Nikakav means no kind of, no sort of, not any at all.

So nikakav razlog is stronger than just a reason with negation. It suggests total absence:

• nema nikakav razlog = he has absolutely no reason / no reason whatsoever

A related word is nijedan:

• nijedan razlog = not a single reason
• nikakav razlog = no kind of reason at all

They are similar, but nikakav often sounds a bit more emphatic or qualitative.

In this sentence, razlog is the direct object of nema, so it is functioning as an accusative object.

Because razlog is a masculine inanimate noun, its nominative and accusative singular look the same:

• nominative: razlog
• accusative: razlog

So even though the form looks like nominative, it can also be accusative.

You may also hear:

• On nema nikakvog razloga za žurbu.

That version uses the genitive, which is also very common with negation in Croatian. So both patterns exist, and learners often meet both.

Croatian often uses a noun where English prefers an infinitive or another verb structure.

• razlog za žurbu = literally reason for haste / reason for hurrying

Here:

• za = for
• žurbu = accusative singular of žurba (hurry, haste)

So the whole phrase means reason to hurry or reason for haste.

A different Croatian structure would be:

• On nema razloga da žuri. = He has no reason to hurry.

Both are natural, but the sentence you have uses the noun phrase.

A is a very common conjunction in Croatian. It often links two clauses with a slight contrast or change of topic.

Here it works like:

• and, but with contrast
• sometimes close to while
• sometimes close to a mild but

So:

• On nema nikakav razlog za žurbu, a ja trenutno nemam vremena...

means something like:

• He has no reason to rush, and as for me, I currently don’t have time...
• or He has no reason to rush, whereas I currently don’t have time...

If you used i, it would sound like a more neutral simple and.
If you used ali, the contrast would sound stronger, more like but.

Yes, they could be omitted.

Croatian is a pro-drop language, which means subject pronouns are often left out because the verb ending already shows the person:

• nema = he/she does not have
• nemam = I do not have

So this could also be:

• Nema nikakav razlog za žurbu, a trenutno nemam vremena za običan ručak.

The pronouns On and ja are included for clarity and especially for contrast:

• he has no reason to hurry
• I, on the other hand, don’t currently have time

Trenutno means currently, at the moment, or right now.

In this sentence it modifies nemam:

• ja trenutno nemam vremena = I currently don’t have time

Its position is fairly flexible. For example:

• Ja trenutno nemam vremena...
• Trenutno ja nemam vremena...
• Ja nemam trenutno vremena...

The version in your sentence is very natural.

This is one of the most important things to notice.

The basic noun is:

• vrijeme = time

But after nemati in the sense of not have time, Croatian very often uses the genitive:

• nemam vremena = I don’t have time

So vremena here is the normal form in this expression.

This is very common with negation and with abstract or uncountable ideas. In practice, learners should remember nemati vremena as a set phrase.

Not in this sentence.

The form vremena can be confusing because it can appear in more than one grammatical role, but here it is best understood as genitive singular of vrijeme in the expression nemati vremena.

So here it means time as an uncountable resource, not times.

After za in this meaning, Croatian uses the accusative:

• za običan ručak = for a normal/ordinary lunch

Both words are masculine inanimate singular, so their accusative forms look the same as nominative:

• običan
• ručak

This whole part depends on vremena:

• nemam vremena za običan ručak = I don’t have time for a normal lunch

Usually it means a normal lunch, a regular lunch, or an ordinary sit-down lunch.

So it does not necessarily mean boring or plain. In context, it suggests something like:

• not even enough time for a proper everyday lunch
• no time for the usual kind of lunch

That is why običan is often better understood here as normal or regular.

No, Croatian word order is relatively flexible.

The sentence you have is natural and clear, but other versions are possible depending on emphasis. For example:

• On nema nikakav razlog za žurbu, a ja trenutno nemam vremena za običan ručak.
• Trenutno ja nemam vremena za običan ručak, a on nema nikakav razlog za žurbu.

Changing the order usually changes focus or emphasis, not the basic meaning.

In your sentence, the structure highlights a contrast between him and me, and the adverb trenutno is placed naturally before nemam vremena.