Comments from unregistered readers are sometimes held in the moderation queue for up to a few days as I do not have the luxury of time to check every day.
I suggest you register through the site admin link in sidebar. It is a painless process and takes just two minutes.
As a registered user, after your first comment is approved, subsequent comments sail through unmoderated unless my word filter catches a naughty word or spam-like behaviour.
From now on, users must be registered and logged in to comment.
Thanking you in advance for your understanding and cooperation.