I know I've seen lots of other newbies ask this same question, but how long can my BP go without pooping before I should start to worry?

I have a girl that's right at a year, I got her in April, and the first two weeks she ate f/t for me, but then she stopped eating for several weeks until I gave her live (7 weeks ago), and since then she's been eating every week. So I think it's been 4-6 weeks since her last bowel movement, although she does pass urates regularly.
I know I should keep better records!