I was on tbe pill for 11 years. So 20 years off before developing bc. I ensured no HRT etc through menopause due to family risk. Made no difference. I know tbe pill can be a protective factor against ovarian cancer so go figure.
I think the risk is only if you have breast cancer as it provides estrogen. It is not the estrogen that causes the cancer just a mutated cell your body doesn't recognise as abnormal.