To each their own! I would totally spend my limited time away from my family doing this (though I am just getting back in shape again so I bet I can't physically!).Insane trip & very impressive.
I will say that (as someone else with a kid), I only have a limited amount of away-from-the-family time and there is absolutely no way that I would spend that time in this manner, but you described it well when you called it a “mission”. There’s something to be said for completing a mission (and it comes with a greater level of satisfaction).