For an enormous number of workers there’s no such thing as quitting time. The line between work and non-work has blurred so much so that the line has essentially disappeared. Leaving the office may be a change of place but not a change of status: You’re still on; still expected to respond to e-mails, texts, and posts; still assumed to be available for a discussion or a review. And that’s not only true after hours but weekends and vacations too. You go off grid at risk of reproach.