Acctually, only that Nova's edge pic will take a really long time.
It uses a lot of volumetrics like the halo, the spraying water, and the sword itself uses a lot of reflection mapping... The ball at the top of the handle is a glass like material so it does a reflection/refraction map of the volumetrics causing it to take a REALLY long time...
The othres should only take 2 hours at 1600 by 1200.
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