Fishing is meant to be an enjoyment, not an endurance! I had paid for a 48 hour session back in the summer but after 24 hours of relentless heat and nothing coming out on the whole (packed!) lake, I went home 24 hours early.
I'm looking at going for an overnighter or two over the next few months but every time I look at the weather forecast, I decide against it. I know, I'm suffering with old age as well!