What is a long enough amount of time to know a man?

My father was, is, a serial sexual abuser. I've known him my whole life.

The man who raped me was someone I'd known for over a year.

The man who sexually assaulted me was a member of my community.

Your premise is utter nonsense. Length of relationship has never once protected a woman from a man who intended her harm.

Convenient way to blame women for men's actions, though.