Ever since we saw Ms. Mayer give a talk at the 92nd Street Y a few weeks back, her words about burnout have been echoing in heads--you know, in the empty space, where our work-life balance is supposed to be. According to Ms. Mayer "burnout," is a figment of your imagination. What you experience as the occasional paralysis due to treating your laptop/iPad/Blackberry like a life-partner and waking in a state of panic at the length of your to-do list, she says is merely a matter of finding the one thing that keeps you going and working that into your schedule.

But what if you need a bunch of different things to keep you going as a functional worker during those 130-hour weeks she recommends? Good luck finding the nerve to ask that question after Ms. Mayer reveals that she "pulled an all-nighter every week for the first five years" at Google . . . and so did everyone else. Feeling sheepish about not quite reaching Google-levels? Not for nothing, startups, but you're probably “working categorically less hard." The message was clear: Suck it up and learn to sleep on your desk.

In a recent interview, however, Ms. Sandberg revealed a dirty little secret about her own office hours:

“I walk out of this office every day at 5:30 so I’m home for dinner with my kids at 6:00, and interestingly, I’ve been doing that since I had kids,” Sandberg said in a new video for Makers.com. ”I did that when I was at Google, I did that here, and I would say it’s not until the last year, two years that I’m brave enough to talk about it publicly. Now I certainly wouldn’t lie, but I wasn’t running around giving speeches on it.”

Is it just us, or was the "giving speeches on it" line a pointed critique at you know who?

Regardless of whether you'd consider yourself a Sheryl or a Marissa (we're a Marissa, with Sheryl-like aspirations), surely leaving at 5.30 shouldn't be something that even Sheryl Sandberg--the woman credited with transforming Facebook into a business--feels ashamed to admit.