Persistent Spell( Deities and Demigods, p. 51)
The deity makes one of its spells last all day.
Extend Spell (PH) ,
A persistent spell has a duration of 24 hours. The persistent spell must have a personal range or a fixed range (comprehend languages or detect magic, for example). The deity is still required to concentrate on spells such as detect magic and detect thoughts to use their effects. Concentrating on such a spell is a standard action that does not provoke an attack of opportunity. A persistent spell uses up a spell slot four levels higher than the spell's actual level.