It took 5 years. I came to HP at the end of 2010, in late October. I wrote like crazy all of 2011, but then made my own blog, and also wrote on Wizzley and Infobarrel. Not "putting our eggs in one basket" was the philosophy then. So the majority of my hubs are 4 yrs. old, they are all evergreen. I add one now and then when I have a new interest, but mainly have one niche. I spend most of my writing time on that. I have a good sized online following now, and use my time writing for paying clients. I believe many of them found me at HP. So thanks, HP! It's the best site to help you develop writing skills and has a great community.
Plus about a third of my hubs moved to niche sites, and the views helped me a lot. I do still keep tweaking and correcting my old hubs when I can, but it hasn't been my main focus. I am getting interested in writing fiction now. But I am very grateful to have finally reached this number, and believe the niche site moves were responsible. I will continue to review old hubs, and may delete a few that aren't getting views. Thanks everyone!