Sudden Extend
( Complete Arcane, p. 83)[Metamagic]
You can make a spell last longer than normal without special preparation.
Prerequisite
Required for
Sudden Quicken (CAr) ,
Benefit
Once per day, you can apply the effect of the Extend Spell feat to any spell you cast without increasing the level of the spell or specially preparing it ahead of time. You can still use Extend Spell normally if you have it.