It is an art for itself to achieve the right balance in everything you do. Working full power 24/7 is only kids talk (well, and investors talk too). You can do that for a very short time, then you need a break - and suddenly, on average your 24/7 combined with the necessary break comes out as a normal, say, 6/10 job ;o).

We all must learn to listen to our body before it tells us to stop. I experience that all the time in the swimming pool (I do ride my mountainbike, but I also swim since ever): the kids jump in, power themselves out in 5 minutes and have to stop then. The experienced swimmers go 10% slower and last for 2 miles. Do the same! And now take 2 or 3 weeks off. Thats the only way to recharge.