Say a wizard gets 8 hours sleep, gets up, and studies his spellbook to fill 3/4 of his spell slots. He then walks for an hour, kills a kobold, and sits down to fill the remaining 1/4 of his spell slots, which should take him 15 minutes. Does he also need to spend an hour resting immediately before preparing his spells, so that the whole process will take him an hour and 15 minutes?
