Baal HaSulam, The Writings of the Last Generation: For the work of one hour of type one, type two works two hours, type three four hours, and type four six hours. Each person is trusted with finding one’s appropriate type of work that suits one’s strength.
Comment: Baal HaSulam divides the working hours into four types: for the weak, for the average, for the strong, and for the quick-witted. Each one decides for himself which type suits him. He is valued according to the program he is associated with.
Answer: All this is quite relative. The matter is not in the hours, but in the potential, in the belonging, etc. Everything depends on the person’s individual characteristics given to him by the Creator, by nature. And the hours of work depend on a person.
From KabTV’s “The Last Generation” 6/12/17