If they work a standard 5-day week, this means they get 5.6 weeks or 28 days of paid holiday each year.
It’s often called annual leave or statutory leave entitlement, but it all means the same thing.
If they work 40 hours a week (i.e. full time), they can’t earn more holiday by working more hours.
Only if they work less than full time do they earn a holiday for every hour worked.