Rules concerning reply length?

Recently I stumbled across the topic called BIONICLE Vs. Hero Factory Vs. Slizers: Dawn Of constraction BIONICLE Vs. Hero Factory Vs. Slizers: Dawn Of constraction. I didn’t post my reply, however, because it was too long (652 words to be exact. This was due to me doing quite a bit of comparison. I think I read somewhere that replies should be short, but I honestly can’t remember. I actually have a few questions.

  1. What is the maximum reply length?
  2. If the maximum reply length is less than 652 words, where do I put this reply?
  3. Should I just post it in a new topic and copy/paste a link, then have a mod close/unlist said topic?

If a Mod or owner could help me out here, that would be great. I’m not going to post a reply until I get an answer, so don’t worry about having to fix my wordy reply to make it follow the rules.