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Yes! definitely one can earn more knowledge and experience by spending more time and making more effort in a task.
If they have the mental capacity to "absorb" the knowledge, then yes it does. If they don't have the capacity and become "over loaded" then there is a danger that the extra tuition could become counter productive.
In most general cases, yes it does. However, the real and serious intention from the learner should be there in order to fulfill this progress.
the more you practice , the more you learn