I can totally see both sides of this argument, now... yikes. I was on the side of verbatim compliance, in which the rules state that your last eight hours worth of casting prevents you from preparing the equivalent slots.
Then I put it into the following, real situation context:
I'm in a dungeon with my party and we just spent the last four hours of game time (counted in rounds, or arbitrary)fighting monsters. We find a safe haven in the form of a room that is hidden and secure. I'm a caster, but I have cast every last spell I had prepared, a fireball being the most recent, one minute ago.
To complicate things, there's a tough monster in the area, looking for us. There's a chance we won't be found. There's also a chance we will, and in our depleted state, not all of us will survive the encounter.
We could rest for eight hours, regain some resources, and head out. If we do, we run the risk of having our rest interrupted by the monster looking for us.
By using one Mythic Point, we can recuperate very quickly. This takes one hour, but in that time, our mythical power-fed bodies are healing and regenerating energies so quickly that we are restored as if we had rested for 8 hours! In just one hour my mind will be clear and fresh and my body will once again be filled with arcane energy and I will be ready to prepare new spells.
Of course, it will take me one full hour after this mythical recuperation to go through my spell book and prepare my full arsenal of spells...
That's about when I realized why there could be an argument.
Rynjin wrote:
It does not say "you recover spells".
It says "You recover spells in one hour as if you had rested for 8 hours".
VERY DIFFERENT.
The rules explain that "the drain on his resources reduces his capacity to prepare new spells." If you are recuperated as if having rested for 8 full hours, then you have effectively recuperated from this drain of resources.
Maybe I'm coming in too late on this. Is this where we are with the debate? In a universal/global sense, only one hour has passed; but the characters have rejuvenated 8 hours worth of time, in which case they should be able to rinse and repeat.
Edit for misspelling.