EU Accession Overview

Becoming a new member of the European Union is a long and often complex process, taking nations an average of nine years from initial application to official accession. 

Source:   Energy & Climate Road Map, GDU - https://greendealukraina.org/products/analytical-reports/the-energy-and-climate-roadmap-18-12-23

Typical timelines for EU accession: https://www.pewresearch.org/short-reads/2022/07/26/how-exactly-do-countries-join-the-eu/ft_22-07-11_eu_2a/