The main resource which explains what you need to do at each stage of the thesis is graduation web: https://www.utwente.nl/en/psy/graduationweb/master/
You can find there also a schedule overview of the activities and proposed meetings with your supervisors for your thesis. The schedule is only a guideline and you are responsible for planning your thesis. Be sure to discuss and agree your personal schedule with your supervisor. Please ask your supervisor in advance about possible holidays and work obligations that need to be taken into account. For example if they are away at a conference or have a period with heavy teaching or marking loads. The months July and August are regarded as holiday months, but if you want to work on your master thesis, you can adjust the planning accordingly.
Note that the entire master’s programme should be completed within one academic year. In case you need considerably more supervision than outlined in the schedule below, this may have consequences for the final evaluation of your master thesis project.