Few things. Cool piece for something who's maybe a beginner but not totally sure for this audience. Also I don't know why this would take six hours? Maybe with the propagating which would mean it could take 24 hours.
@brackin Thanks for the comment. Both fair points. I submitted it because I thought it might be helpful for experienced people who keep getting asked for help. The six hours refers to my (fairly leisurely - read non-specialist) pace; I didn't factor in propagation because I was just counting the time taken by the creator.
[Edit: reposted so it's threaded with the original comment.]
[Edit: reposted so it's threaded with the original comment.]