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The rulebook states the wizard who casts the spell may chose to end the spell at any time.
Does this then mean that a wizard can just instantly turn the spell off if something like a purple sun takes a wrong turn and heads back towards his own troops?

Gee, didn't mean to start a nerd fight ;P

Glad you guys are having such a thrilling debate, but I was more wondering about vortex type spells like purple sun and bad moon.

As I understand it from the posts above. RAW says yes, however, it appears to have been corrected in the FAQ, good deal. Thanks for the info.