This article explains more about the length of the employment agreement.
The term of your Phase 1-2 employment agreement will start with one week. This term will implicitly, every time be extended by one week when you work.
Phase 1 lasts 26 (worked) weeks. Phase 2 lasts 52 (worked) weeks. In total, this employment agreement can last 78 (worked) weeks. Please consult the NBBU-cla for more information.