Answer: It depends on the attribute a person’s desire is in, on the society he is in, and on the circumstances under which he studies Kabbalah and implements it. So it is impossible to say how we can measure the intensity he has to put into it in order to enter the upper world or even to correct himself.
When a person studies the wisdom of Kabbalah, these measuring units are revealed to him, the units of effort, and then he begins to realize how many such units are needed in order to reach each level. The numbers of these units differ from one person to another.
It is the same in our world: Even if we studied in the same school, the same university, or worked together, each of us would have to make a different amount and quality of effort in order to accomplish the same task.
From the Kabbalah Lesson in Russian 1/17/16