I mixed up a tense or two there. It was done in 4 years, even accounting for Covid. The timeline looks like this

2019: Kick-off

2020: Construction in Ireland basically halted due to Lockdown for 18 months

Q3'2023: Fab 34 begins running a ‘First Full Loop’ of silicon

Q4'2023: Fab 34 completed. Doubles the manufacturing capacity available in Ireland, enabling the production of Intel 4 and Intel 3, some of the company’s most advanced process technologies, and the first to incorporate EUV lithography

2024: Intel sold 49% stake to Apollo GM for $11.2bn

2026: Intel buys back stake for $14.2bn

Q2'2026: Intel announce a further $5.7bn investment to upgrade existing capacity for server chips, slated for completion by late 2027