Answer (from own knowledge of the Greek Code of Civil Procedure, KPolD, as in force in October 2026; I could not check the text of the articles, so the paragraph citations below are from memory).

Step 1 - Which time limit. The judgment is a final judgment of the Multi-Member Court of First Instance under the ordinary procedure, so it can be appealed (art. 511 KPolD; art. 513 par. 1 KPolD). The appeal is filed with the court of appeal (Efeteio). The company is seated in Heraklion, Greece, so it is not resident abroad and its residence is not unknown. The 30-day limit therefore applies, not the 60-day limit (art. 518 par. 1 KPolD).

Step 2 - What starts the clock. The judgment was served on the company at the plaintiff's initiative on Thursday 16 July 2026. Under art. 518 par. 1 KPolD the 30 days run from that service, not from publication on 2 July 2026. The two-year limit from publication (art. 518 par. 2 KPolD) only applies when the judgment has not been served. Here it was served, so par. 2 does not apply.

Step 3 - Day on which counting starts. The day of service is not counted. The limit starts on the day after service (art. 144 par. 1 KPolD, with art. 240 of the Civil Code). The first day of counting would be 17 July 2026.

Step 4 - Judicial vacation. The deadline for an ordinary remedy that runs during the judicial vacation (1 July to 15 September) is suspended. The vacation period is not counted (art. 147 KPolD, as in force after Law 4335/2015). Service fell inside the vacation, so no day runs between 17 July and 15 September 2026. Counting begins on 16 September 2026, which is day 1.

Step 5 - Counting 30 days. Day 1 is 16 September 2026. Day 15 is 30 September 2026. Day 30 is 15 October 2026 (art. 144 par. 1 KPolD; art. 518 par. 1 KPolD).

Step 6 - Weekend or holiday check. 15 October 2026 is a Thursday. It is not a Saturday, Sunday or public holiday, so no extension under art. 144 par. 3 KPolD (art. 241 of the Civil Code) applies.

Step 7 - Conclusion. The last day on which the appeal can be filed is Thursday 15 October 2026.

RESULT: deadline = 2026-10-15; rule = art. 518 par. 1 KPolD (30 days from service), with art. 144 par. 1 and 3 KPolD and art. 147 KPolD (judicial vacation)
