I know it's a pain to have a timely conversation as a trial member.
It's only about 25-30 approved posts. After that, you'll gain full posting privileges. I wish I could put an exact number on it but it has varied with every member so far. I check 6gc a few times a day and approve posts as soon as I see them but I might miss them for a while. I only get notifications of invisible threads that need to be approved, not of individual posts, so if there haven't been any posts in a particular section of the forum then I may miss the post for several hours. I check each individual subforum in the morning and in the evening for invisible posts but I often miss them in the middle of the day for several hours. If there is a post in an old thread then I may not see it for quite a while. If that's the case and a post is taking too long to be approved, don't hesitate to message myself or Rusty and we'll approve it for you.