You can make a spell last all day.
Prerequisite(s): Extend Spell.
Spells with a fixed or personal range that have a variable duration can have their duration increased to 24 hours. Spells of instantaneous duration cannot be affected by this feat, nor can spells whose effects are discharged or effects that hit point damage. You don’t need to maintain concentration on prolonged detect spells (such as detect magic) for you to be aware of the mere presence or absence of the subject detected, but gaining additional information requires concentration as normal.
MP Increase: +6 (a prolonged spell costs 6 additional MP more than the actual MP cost of the spell.)