One hiring manager screen, one manager phone call. After the manager phone call, they went radio silent. I followed up with the recruiter at least three times with no response. It's been 4 months, and I can see on LinkedIn that they've filled the position.
If candidates are putting in the time and effort to be prepared for your interviews, give them the common courtesy to let them know what happened. Even Google and FB does this. Athleta, I don't know where you think you can behave like this, but I'm glad I dodged a culture where this is acceptable behavior.