ANSWER (from own knowledge of the Greek Code of Civil Procedure, CCP / ΚΠολΔ, as in force in October 2026; no sources consulted)

Facts: Final judgment of the Multi-Member Court of First Instance of Heraklion (ordinary procedure), published 2 July 2026, served on the company on Thursday 16 July 2026 at the plaintiff's initiative. The appellant is a company seated in Heraklion, i.e. it is established in Greece.

Step 1 - Which time limit applies.
Art. 518 par. 1 CCP: the time limit for an appeal is 30 days if the appellant resides (is seated) in Greece, 60 days if abroad or of unknown residence, and it runs from service of the final judgment. The company is seated in Greece, so the limit is 30 days. Because the judgment WAS served, the alternative limit of art. 518 par. 2 CCP (two years from publication, for judgments not served) does not apply. Publication on 2 July 2026 is therefore irrelevant to the start of the period; the trigger is service on 16 July 2026.

Step 2 - Starting point and counting.
Art. 144 par. 1 CCP (with arts. 240-241 of the Civil Code, applicable via art. 144 CCP): the day of the event that triggers the period (here the service) is not counted; counting starts on the following day. Day 1 = Friday 17 July 2026. Day 30 = Saturday 15 August 2026 (14 days remain in July after the 17th... counting: 17-31 July = 15 days; 1-15 August = 15 days; total 30). Nominal last day: Saturday 15 August 2026, which is also the public holiday of the Dormition (15 August).

Step 3 - Last day falling on a Saturday / holiday.
Art. 144 par. 3 CCP (with art. 243 Civil Code): if the last day of a procedural time limit is a public holiday, Saturday or Sunday, it is extended to the next working day. Next working day: Monday 17 August 2026. This still falls inside the judicial vacations, so step 4 applies.

Step 4 - Judicial vacations.
Art. 147 par. 1 CCP: a time limit for exercising a legal remedy (including an appeal) that expires during the judicial vacations (1 July - 15 September, art. 147 CCP) is extended until 30 September. The period here expires in the vacations (15/17 August), so it is extended to 30 September 2026, which is a Wednesday (a working day), so no further shift under art. 144 par. 3 CCP is needed.

Step 5 - Conclusion.
The last day for filing the appeal (by lodging it with the clerk's office of the Court of Appeal of Crete / the competent court, art. 495 par. 1 and art. 511 CCP form requirements) is Wednesday 30 September 2026. (Without the vacation extension the day would have been Monday 17 August 2026.)

RESULT: deadline = 2026-09-30; rule = art. 518 par. 1 CCP (30 days from service) with art. 144 par. 1 and 3 CCP (counting) and art. 147 par. 1 CCP (extension to 30 September of limits expiring during judicial vacations)
