I found the text below on the internet and I'm confused about what the expression "give or take a page or two" means in context. I assume that the first part of the sentence, i.e. "at the pace of about two pages a year", means that he can't write more than that many pages per year, but I just can't decipher the meaning of the second part, that is, the expression mentioned in the title. Here is the text in question:
Dear J.
We've gotten so many inquiries about the song "Dear J." (offered as a bonus track on new record Meant to Be) that we decided to post a little something on the topic :-)
First, yes, it's true. I was a teen-age runaway. I'm not advocating it for troubled teens today, but this was a simpler time (the '80s!) and I had my reasons. I'm currently working on a novel on the topic (at the pace of about two pages a year, give or take a page or two), so maybe someday a more detailed explanation will be available.