Comment by xorcist

The comment of yours is likely in good spirit, but it mixes reasonable things with completely outlandish ones.

From experience, averaging 8 km/h for 2.5 h with 50 kg on the back is just not possible for most people, and likely not for you or me either. Doing it in uneven terrain sounds completely unrealistic no matter how fit you are.

Just suggest something realistic instead, like 20 kg and 5 km/h in easy terrain for healthy people, and and least it would be something possible to discuss.

Going 4 days without food is something you can absolutely try if you like, if you are healthy or otherwise secure. But going 2 days compeltely without water is stupid. Don't do it on purpose, ever, no matter how fit you think you are.