One of your spells works all day long.

Prerequisites: Extend spell

Benefit: A persistent spell has a duration of 24 hours. The persistent spell must have a personal range or a fixed range (comprehend languages or detect magic, for example). The character is still required to concentrate on spells such as detect magic and detect thoughts to use their effects. Concentrating on such a spell is a standard action that does not provoke an attack of opportunity. The spell counts as four levels higher than normal. The Spells casting time must be exactly one standard action and the duration longer than one single round. You may not have more than one persistent spell per spell level and may never persist a fourth level spell.