Obrada dokumenta dugo traje.

Because obrada is in the nominative singular, which is the normal form for the subject in Croatian.

So the structure is:

• obrada = processing / the processing
• dokumenta = of the document
• dugo traje = takes a long time / lasts a long time

So literally, the sentence is built like:

The processing of the document lasts a long time.

Even though English often prefers a more verbal expression like Processing the document takes a long time, Croatian is very happy to use a noun like obrada as the subject.

Because after the noun obrada, Croatian commonly uses the genitive to show what is being processed.

• obrada = processing
• dokumenta = of the document

So obrada dokumenta means processing of the document.

If you used dokument here, it would be in the nominative form, and the phrase would not work correctly in standard Croatian.

This is a very common pattern:

• obrada podataka = processing of data
• obrada slike = processing of the image
• obrada dokumenta = processing of the document

It is genitive singular.

The base noun is:

• dokument = document

Its genitive singular is:

• dokumenta = of the document

This often confuses English speakers because -a is very often associated with feminine nouns, but here dokument is a masculine noun, and dokumenta is just its genitive singular form.

In this sentence, no. Here it means singular: of the document.

That is because:

• obrada dokumenta = processing of the document
• obrada dokumenata = processing of documents

So if the meaning is about one document, dokumenta is genitive singular. If it were about multiple documents, you would normally say dokumenata.

Because dugo is an adverb here, not an adjective.

It modifies the verb traje:

• traje = lasts
• dugo traje = lasts a long time

Adverbs do not agree with nouns in gender, number, or case. So you use dugo no matter what the subject is.

Compare:

• duga obrada = a long processing
  
  • here duga is an adjective describing the noun obrada
• obrada dugo traje = the processing lasts a long time
  
  • here dugo is an adverb describing the verb traje

Traje is the 3rd person singular present tense of trajati, which means:

• to last
• to continue
• to take some time

In this sentence, it is best understood as:

• takes a long time
• or more literally, lasts a long time

So:

• Obrada dokumenta dugo traje. = Processing the document takes a long time.

Because the subject obrada is singular.

Croatian verbs agree with the subject in person and number:

• obrada = singular
• therefore traje = singular

If the subject were plural, the verb would also be plural. For example:

• Obrade dokumenata dugo traju. = The processing procedures of documents take a long time.

That is a different sentence, but it shows the agreement pattern.

Yes. Croatian word order is more flexible than English word order.

The neutral order here is:

• Obrada dokumenta dugo traje.

But you could also hear:

• Dugo traje obrada dokumenta.

This still means the same thing, but the emphasis changes slightly. Starting with dugo traje puts more focus on the fact that it takes a long time.

So:

• Obrada dokumenta dugo traje. = neutral
• Dugo traje obrada dokumenta. = more emphasis on the duration

No. Croatian does not have articles like English a or the.

So Croatian simply says:

• obrada dokumenta

and the context tells you whether English should use:

• processing of a document
• processing of the document
• document processing

In this sentence, English often naturally uses the document or simply document processing, depending on context.

It can be either, depending on context.

The present tense in Croatian can express:

1. a general fact / usual situation

   • Obrada dokumenta dugo traje.
   • Document processing takes a long time.

2. a current ongoing situation

   • The processing of the document is taking a long time.

So the sentence itself does not force just one reading. The surrounding context decides.

Yes, but the structure would be different.

This sentence uses a noun phrase:

• obrada dokumenta = processing of the document

Croatian could also express a similar idea verbally, for example with a clause such as:

• Dugo traje obraditi dokument. — not standard/natural
• more natural alternatives would be rephrased differently

In practice, obrada dokumenta dugo traje is a very natural Croatian way to say this, especially in formal, technical, or administrative language.

Croatian often prefers this noun-based style in official or technical contexts:

• obrada zahtjeva = processing of the request
• obrada podataka = data processing
• obrada dokumenta = processing of the document

Yes. It is very common, especially in formal, administrative, legal, and technical language.

Croatian often forms expressions like:

• obrada podataka = data processing
• obrada prijave = processing of the application
• obrada zahtjeva = processing of the request
• obrada dokumenta = processing of the document

So this sentence sounds very normal and natural, especially in contexts like offices, software, bureaucracy, or workflow descriptions.