Spells are memorized (or prayed for) after a rest cycle. They cannot be changed once studied (or prayed for) until after the next rest cycle. There is approximately 16 waking and 8 resting hours that makes up one full cycle and, though you can certainly rest longer if you like, spells can only be regained once per 24 hours. (approx)hyperborea wrote:(Ogre Mage, what's your rules regarding changing a spell during the day? I'm not sure I would, but if I wanted to change my prepared invisibility for continual light would you allow it? And if so, how much time would we have to spend for me to do so?)
Keep in mind that it is after sunset right now.