What's wrong with explicitly asking it? I do that and their response says everything. If they're defensive about why everyone needs to work 60+ hours, then that's what you'll get. If they're defensive about how work-life balance is important, then that's what you'll get too.
You do not ask them. You tell them.<p><a href="https://www.youtube.com/watch?v=1ey6X0TgOrg" rel="nofollow">https://www.youtube.com/watch?v=1ey6X0TgOrg</a>