Did 8k run and 8k bike ride. The latter was a family ride, where the biggest challenge was to… Actually get my daughter up the steep hill. But she managed it like a pro ;);)
Having been out of active academia for a decade now, I can safely say I am an outsider. This gives me a seasoned outsider perspective, coupled with some leftover angst from my PhD days. Today, I was once more at the academic event, observing the interaction of native academics (associate and full professors) in their native habitat.
It was slaughter by pen and scathing remarks, all done while smiling and eating canapés.
It depends, of course. If you are single, you can do whatever you want, organise your time, etc. In general, you should limit yourself, pace yourself, take time for physical activity and, most importantly sleep and eat right (meaning: 7-8 hours per night and according to your diet – you should have normal BMI, for lack of better measure).
If you are in any kind of relationship, with children, etc., then of course you have a different thing at your hands. Basically, you have to follow the same general rules as above, but following them will require crazy amounts of discipline and compromise. And of course, learn to say “no” and good luck!