For any of you commenting for the first time, in order to avoid spam the comments from first-time commenters are automatically held for my approval. After the comment is approved then all your subsequent comments will go up immediately.
I check comments several times a day, but there may be a delay in getting your comment up if I am out and about. Rest assured it will appear.
Also sometimes our spam filter will catch your comment and I will have to approve it. No telling why the filter does this, but it will occasionally catch even long-time commenters. Just something we have to deal with.