>>114355241. Get a life. The best mathematicians are the ones who have a life and hobbies outside of doing math. Studying 24/7 is actually detrimental to you.
2. If every theorem feels like a marathon you're doing it wrong, or should switch to applied math. It should feel more like you're eating a nice meal, where you savor every bite, and once you're done with dessert you're too full for now but can't wait to eat something as good again.