I have a 6 year old PR4 site that hadn't been touched in more than 4 years, up until a month ago. For the last month I've added over 50 new high quality, unique, from-scratch articles totaling over 50,000 words. There has been no real increase in traffic at this point and I'm hoping somebody can give me a little insight, or at least an opinion. My online experience is fairly extensive but my knowledge of SEO specifically is definitely limited, so I want to now how long a high PR site needs to be updated with quality content before search engine traffic will start to build. Thanks for your time.