Prolonged Summons (Feat)

Your summoned creatures are bound to this plane for longer than normal.

Prerequisites: Caster Level 21, Cha 21, Summoning Perfection (Feat)

Benefit: Whenever you summon a creature or creatures with a summon monster or gate spell you cast yourself, the summoned creature(s) remain in your service for up to one minute per level unless destroyed or dismissed first.