It's definitely different for US vs non-US schools, but I don't think counting in years is a good measure as it disregards depth, skipped courses, total # of courses, # of concurrent courses, etc. Even course stats like that are pretty handwavy.

It's more useful to refer to the CS curriculum standards across ABET accredited schools.

That said, we don't have anything like a comprehensive undergrad final exam for CS schools that would validate this.