Rkhet said:The feat does not automatically grant you a permanent effect.
This spell’s effect is permanent.
This spell makes certain other spells permanent.
Designate any one of the character’s spells whose area is an emanation from the character. This spell’s effect is permanent (though the character can dismiss or restart it as a free action). Effects that would normally dispel this spell instead suppress it for 2d4 rounds.
Rkhet said:I interpret this as to mean the spell's duration is modified to permanent. It still has to be cast, though.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.