I was wandering how Extend Spell affects certain spells. I know it doubles the duration, but does it double effects as well? Unless I'm missing something there doesn't seem to be a ruling. It says it doesn't work with "instantaneous" spells, but never says anything on the effects.
For instance, it won't make the effect of color spray last twice as long, but what about, say, stinking cloud? It would make the duration twice as long, but what about the effect's duration? Would I get 2d4 rounds of being nauseated?
I'm sure a lot of people will answer with "well if it doesn't work with color spray, common sense says it wouldn't work with other effects either", but I'm looking for an actual written ruling.