15 days a year seems so little to me. I have 23 as standard and then I purchase 5 additional ones every year. I also can work up overtime and take full or half days off multiple times a year.
Then I also have 8 or 9 'bank holidays' which is a public holiday like Christmas or St Patricks Day (I'm in Ireland)
Then I also have 8 or 9 'bank holidays' which is a public holiday like Christmas or St Patricks Day (I'm in Ireland)