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Thanks for you comments.  I currently blog post about once a week for for various blogs and websites.  I mix in 9 do follow and usually 1-2 no follow to make it look organic.  I appreciate your response!

I am starting to do some manual back-linking for a medium competition word with high traffic.  I plan to start back linking with like niche blogs with non spam comments, like niche directories, like niche forums, and guest blogging.

My domain is over 3 years old and ranks for multiple keywords, but I'm going to concentrate specifically on this keyword, but need to know how many links to back-link a day.  Again none of these will be spam, but will be of real quality.

I was thinking 10-20 a day, but unsure.