Extend Spell( Player's Handbook v.3.5, p. 94)
You can cast spells that last longer than normal.
Mastery of Faerie Enchantment (PE) , Mastery of the Azure Sky (PE) , Mastery of the Battleground (PE) , Mastery of Twilight Denizens (PE) , Persistent Spell (CAr) , Persistent Spell (DD) , Persistent Spell (FRCS) , Persistent Spell (PG) , Persistent Spell (TB) ,
An extended spell lasts twice as long as normal. A spell with a duration of concentration, instantaneous, or permanent is not affected by this feat. An extended spell uses up a spell slot one level higher than the spell's actual level.