The minimum period is 2 weeks. However, this is not always the case. The inclination of the lunar orbit to the plane of the ecliptic is about 5 °, therefore, for an eclipse, it is necessary that the moon during a new moon or full moon passes near one of the nodes of the orbit (i.e., near the point of intersection of the orbit and the ecliptic).
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.