Our best engineer spent 2 weeks full time updating our codebase from 7 to 8 using rector (the project was already running PHP 7 but still had a lot of deprecate

Our best engineer spent 2 weeks full time updating our codebase from 7 to 8 using rector (the project was already running PHP 7 but still had a lot of deprecated code from the PHP 5 era which didn't work on PHP 8). That would be eternity without Rector.