Η διόρθωση στην εφαρμογή φαίνεται μετά από δύο λεπτά.

Because διόρθωση is a feminine noun in Greek, so it takes the feminine definite article η in the nominative singular: η διόρθωση = the correction. Many Greek nouns ending in -ση / -ξη are feminine (e.g., η λύση, η ανακοίνωση).

It’s in the nominative case because it’s the subject of the sentence (the thing that “appears/is visible”). The nominative singular feminine article is η.

στην is a contraction of σε + την:

• σε = in / to / at
• την = the (feminine accusative singular)

So στην εφαρμογή literally means in the app. The noun εφαρμογή is feminine, so it uses την, not το.

In Greek, many prepositions—especially σε—take the accusative case. So even though εφαρμογή isn’t a direct object, it’s still accusative because it follows σε (→ στην).

φαίνεται is 3rd person singular, present tense, middle/passive voice of φαίνομαι = to appear / to seem / to be visible.
It’s singular because the subject Η διόρθωση is singular.

It’s middle/passive in form, but in meaning φαίνομαι usually works like an intransitive verb: “it appears / becomes visible.” No agent (“by someone”) is required. You can think of it as “The correction shows up.”

In everyday Greek, μετά από + time period is very common to mean after (a duration of).
You may also see μετά (από) δύο λεπτά—often από is optional, but including it is very natural and clear in modern usage.

After μετά από, the noun phrase is in the accusative: δύο λεπτά.
Also, δύο (two) doesn’t change form for gender/case, and λεπτό becomes plural λεπτά.

λεπτό (minute) is neuter, so:

• singular: το λεπτό
• plural: τα λεπτά

In your sentence it’s plural accusative: δύο λεπτά (same form as nominative plural for neuters).

Yes. Greek word order is flexible because endings/articles show roles. For example:

• Η διόρθωση φαίνεται στην εφαρμογή μετά από δύο λεπτά.
• Μετά από δύο λεπτά φαίνεται η διόρθωση στην εφαρμογή.

All are possible; the difference is usually emphasis (what you want to highlight first).

Greek typically uses σε/στη(ν) for both in and on in many digital contexts. So στην εφαρμογή is the standard way to say in the app / within the app interface.

διόρθωση can cover both depending on context: a correction/edit (e.g., text), or a fix (e.g., a correction you make). In software contexts, it often means an edit/correction that becomes visible after some time.

Greek doesn’t need an extra word here; μετά από δύο λεπτά already expresses timing. If you wanted “only after two minutes,” you could add emphasis, e.g.:

• μόνο μετά από δύο λεπτά = only after two minutes.