December 16, 2016 will be my 5 years-keep reading the research to see if any new advancements in length of taking arimidex. So far, research still supports 5 years. I like the idea of taking one more day because I considered that also-thoughts went to "well, even though it ends on 16 December, the pill needed 24 hours in my system, so I need to take it one more day,". Thank you for perspective. I also have your book-helps me cope.