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Every human brain has it own capacity and limits, same way a memory card cannot exceed its capacity. When study exceeds the brain limit, the more the more loses it and some call it brainwash.

I think this depends strongly on the country and the underlying law or regulation. In Austria for example, you can theoretically study forever, but after the 6 semester you have to pay for further studying. In most of the countries this is the situation I think. You should consult your local university support center to receive further information.