When you start to stop feeling effects from the beginner meditations it is time to move on to the intermediate ones. But we are all different and some people spend longer on the beginner meditations, others move onto the intermediate ones and others still attempt the advanced ones early in their journey.
What matters is that whatever you are doing it needs to be done CONSISTENTLY and regularly in order to attain results and some meditations become a part of your lifelong program such as cleaning your aura, foundation meditation (which later becomes the drawing of energy as your faculties increase) and chakra spinning which is essential for raising the vibrational quality of your soul.
By far the most effective meditations for a beginner are those that incorporate the vibrations, the words of power which activate and empower the chakras and the fastest route to advancement is through these as sound is the most accessible and lowest order of the electromagnetic spectrum, followed by light which stands to reason that a beginner at low vibration uses chant to access the powers and increase them until such time as light becomes the most basic of his or her vibrating frequency after which light becomes the most effective.
HAIL SATAN!