Ο διακανονισμός αργεί δύο μέρες.

Ο is the masculine singular definite article, meaning the.

It agrees with διακανονισμός, which is a masculine singular noun. So:

• ο διακανονισμός = the settlement / the arrangement / the payment arrangement

In Greek, the definite article is used very regularly, often more regularly than in English.

It is in the nominative singular, because it is the subject of the sentence.

So the basic structure is:

• Ο διακανονισμός = the subject
• αργεί = the verb
• δύο μέρες = how much it is late / delayed

The ending -ος is a very common nominative singular ending for masculine nouns.

Αργεί is the 3rd person singular present of αργώ.

In this sentence, it means something like:

• is late
• is delayed
• is running two days behind

The verb αργώ can have a few related meanings depending on context, such as:

• to be late
• to take a long time
• to delay / be delayed

Here it clearly refers to a delay.

Greek often uses a bare time expression to show how much something is late, early, long, etc.

So:

• αργεί δύο μέρες literally looks like is late two days
• natural English becomes is two days late or is delayed by two days

English usually needs by, but Greek often does not.

It functions as an accusative expression of extent/duration/amount.

In other words, it tells you by how much the delay extends.

A useful thing to notice is that μέρες looks the same in nominative plural and accusative plural, so the form itself does not change here.

Also, δύο does not change form.

Μέρες is the everyday spoken form of ημέρες.

Both mean days.

• ημέρα = day
• ημέρες = days
• μέρα / μέρες = very common shorter everyday forms

In normal modern spoken Greek, μέρες is extremely common and natural.

Yes, that would be possible, and the meaning would be very close.

• αργεί = is late / is taking longer / is delayed
• καθυστερεί = is delayed / is running late

Sometimes καθυστερεί sounds a bit more explicitly like there is a delay, while αργεί can feel slightly broader. But in many contexts, both work.

That is the most neutral word order here.

Greek word order is more flexible than English, because the endings help show what each word is doing.

So this sentence presents the information in a natural order:

• subject: Ο διακανονισμός
• verb: αργεί
• amount of delay: δύο μέρες

You could change the order for emphasis, for example:

• Δύο μέρες αργεί ο διακανονισμός.

That would put more focus on two days.

Normally, in standard Greek, no if you mean the specific settlement/arrangement.

Greek usually wants the definite article with a specific singular noun:

• Ο διακανονισμός αργεί δύο μέρες.

Without the article, it would sound unusual in ordinary speech, unless it were:

• a headline
• a note
• a label
• a very compressed style

So for normal sentence-building, keep ο.

Yes. Αργεί is present tense.

Greek often uses the present to describe a situation that is true right now:

• it is late
• it is currently delayed
• it is running two days behind

So even if English might phrase it in different ways, the Greek present tense is completely natural here.

A very literal version would be:

• The settlement is late two days.

That is not natural English, but it helps show the Greek structure.

More natural English versions are:

• The settlement is two days late.
• The settlement is delayed by two days.
• The settlement is running two days behind.

Yes, but it is a bit more formal or administrative than a basic everyday word.

It can refer to things like:

• a settlement
• an arrangement
• a payment arrangement
• an installment agreement
• an account settlement

So the sentence has a slightly official or business-like feel, depending on context.