Αφού τελειώσω τη δουλειά, έχω τη συνήθεια να περπατάω καθημερινά για λίγη ώρα.

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Breakdown of Αφού τελειώσω τη δουλειά, έχω τη συνήθεια να περπατάω καθημερινά για λίγη ώρα.

• η δουλειά: the work
• έχω: to have
• να: to

Questions & Answers about Αφού τελειώσω τη δουλειά, έχω τη συνήθεια να περπατάω καθημερινά για λίγη ώρα.

What does Αφού mean here, and how is it different from μετά or όταν?

In this sentence Αφού means “after / once”, introducing a time clause: Αφού τελειώσω τη δουλειά = “After I finish work / Once I’ve finished work”.
It shows that one action is completed first (finishing work) and then another follows (walking).

• μετά is usually a preposition or adverb: μετά τη δουλειά = “after work”. To use a verb, you’d normally say μετά τη δουλειά or more colloquially μετά που τελειώσω τη δουλειά.
• όταν means “when(ever)” and is more neutral about sequence; it just says at the time when something happens. Αφού here is stronger about “after that is done, then…”.

So Αφού in this sentence is best understood as “after / once” rather than “since”.

Why is τελειώσω used instead of τελειώνω?

Τελειώσω is the aorist subjunctive form, and it is used because:

1. The action is future / not yet realized from the speaker’s point of view (it happens each day, after work).
2. The aorist aspect focuses on the action as a single, complete event: “after I have finished (my work)”.

Greek often uses the aorist subjunctive in time clauses with Αφού for future or habitual sequences:
Αφού τελειώσω, περπατάω = “After I (have) finished, I walk.”

If you said Αφού τελειώνω τη δουλειά, it would sound odd here; τελειώνω (present) is used more with όταν for habits:
Όταν τελειώνω τη δουλειά, περπατάω = “When I finish work, I walk.”