The number of days holiday that you receive as per the terms of your contract is 28 days. This equates to 5.6 weeks. Therefore, 5.6 weeks as percentage of the “working week” year is 12.07% (5.6 weeks / 46.4 weeks). If you are working via a teaching agency, the percentage is 14.36% (5.6 weeks / 39 working weeks).