It has been taking me approximately 8 hours per hub, from concept to finish. I might play around a little with it, fine tuning, afterwards but I've found that this is the best way for me to work. I guess I have a little O.C.D. when it comes to working on them ... once I start, I want to complete them so I do the research as I go. I find that this way everything stays fresh. Everyone is different, though.