My point stands. You want fiction-style play, you need to offer a fiction-style world. In fiction, they don't fight battles 12 hours a day, 7 days a week. I don't remember a single fantasy book where the protagonists had multiple battles two days in a row.
While I cannot recall any fantasy novels at the moment, I don't doubt that there are- probably something dealing with an indefatigable foe, like undead or constructs.
You see it in zombie fiction, the Evil dead movies, slasher flicks, and even an episode of nBSG- I doubt Horror & Sci-Fi's cousin Fantasy has missed that trick, especially when it's so full of options to do it with.
No rational, sane person in the adventurers' shoes would consider themselves quite capable of adventuring at that point.
You're missing one aspect of the problem: no rational, experienced person in the adventurers' shoes would consider using all of their resources in just a few encounters. They would hold something in reserve as long as possible.
That's what I was getting at when asking how many times Gandalf would "nova and nap."
15 Minute Men expend their resources profligately, sometimes to the point of massive overkill, and thus render themselves toothless while still quite physically capable.
In contrast, in the group I've been a part of since 1998, there is a guy I've gamed with since 1985 who plays wizards almost exclusively. As I've recounted many times on these boards, it almost doesn't matter how many encounters we have, he still has spells at the end of the day. Why? Because he casts 1-3 spells per combat, then STOPS. Instead of expending extremely limited resources, he'll wander the battlefield doing Coup de graces or taking potshots with his crossbow or dagger.