Another reason it can be tough is that certain metrics are defined differently between counties.

Many metrics will list the UK a having one of the highest holiday allowances in Europe since legally full-time workers are entitles to 28 days off, however the UK includes Bank Holidays (8-9 days) in this total. For comparison, a country like Austria has a minimum of 5 weeks holiday (25 days) but this is IN ADDITION TO state holidays (of which there are 13, but some will be on weekends so the absolute amount varies year to year). Centrally this end up with everyone in Austria having something like 33-34 days off.

I’ve yet to see a list that accounts for this, so most have the UK right near the top. I would bet that this metric is no different.