Boggle, there's a separate validation offered by some member states for non-commercial operations on any of 28 days in a calendar year. Art 8(3) in Commission Delegated Regulation (EU) 2020/723. No skill test or written exam required. In addition, until 20 June 2022, some member states will accept a third-country licence for a non-commercial operation pursuant to art 12(4) in the Aircrew Regulation.