Personally, I write hubs in about 2 or 3 hours. Not one of my hubs have higher than a 80 hubscore though, and I have always been disappointed. I think I am going to spend a couple of days instead of a couple of hours on a hub next time. I hope to one day create a hub that has a hubscore of over 95. To keep perfect quality, I would say it is not possible to complete the 30 day challenge without losing quality, but because I have not done it yet, when I do I will have more info.