You must be hardier than I am. I'm five years younger and eight and a half hours standing (after a couple of hours walking around Marseille) left me shattered. I'm still feeling it now...and I thought I was pretty fit.Well I am 72 and have been going for over 60 years. Just had to do this as another 'first' - and would certainly go back.
With the heat and exhaustion, I came close to fainting on the bus back. Far too much for me