The effect of most spells is temporary. Spells that create, summon, or reshape matter and energy only continue if the Spellcaster maintains the spell. The same is true for spells used to perform the Assist, Aid, Obstruct, or Complicate Actions. Once the Spellcaster releases the spell, the world goes back to its original state. 

The effects of spells that move or heal, and work done using a spell to emulate a skill, are permanent. In addition, changes to targets and the environment caused by spells, like the damage from a fireball, remains after the spell ends.