Let's say you have a review website with 3 products, how many words do you write for each article to have the best balance between quality information & CTR to the clickbank site? I have used 180 words for my rank #1 review, 205 for the #2 and 140 for the #3.
But also a long review wont interest them either, come on don't write a huge "Review" remember you are going to send them to an even larger Sales page they'll be bored and will not read it again