In some cases, it is possible to work a four-day work week instead of a five-day work week and extend the duration of your contract. This depends on, for example, whether your project has a strict end date or not. You can discuss this option with your supervisor. You can switch to a four-day work week during your contract.If you want to build up extra holiday hours, you can work 40 instead of 36/38 hours per week. Contact HR for more information.