Hi,
I am writing content for the web from past 2 years. Currently I am writing articles related to the medical field. The pattern in article writing I am following currently is similar to your requirement - 2 backlinks in an article, writing blogs, posting them through wp, etc.
I don't compromise on quality of my work myself and can efficiently write 3 articles everyday. Therefore, the time required to complete your project is 90 days.
Regards
Shilpa