Does turning undead count as an attack for purposes of breaking protection from evil?
No it does not!
How much effort does turning undead actually require?
I always assumed it counts like an attack...
What do you mean by your statement, though? There's a difference between "counting like an attack" for the purposes of actions within a combat round, and then there's counting as an actual attack for the purposes of Protection from Evil or Sanctuary. The former appears to be the case, the latter does not.
hmm, wonder why this question is coming up from you two... :)
NO REASON!
...why do you ask?