I enjoy studying for long hours.

Hours are the wrong unit, and most people know it while pretending otherwise — usually in a library, at a desk, near a book, for six of them.

Two hours in which you cannot hear the room will beat six of that comfortably. The six-hour version largely measures endurance of a chair.

There is a real pleasure available in long study, but it lives in the absorbed stretches rather than in the total.

Count the attention rather than the sitting, and you will probably find you are already doing more than you have been giving yourself credit for.