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I tell new employees that I will not praise them for working extra hours because I don't want them to. I do not have hard data, but anecdotally, when I see teams adopt this mentality productivity seems to increase. My guess is that it's because they try tidy up the loose ends/ideas that annoy folk into jumping back onto the work laptop later in the evening.

I've always explained it like this: I would prefer that you work reasonable hours and no more. Just make sure that you're giving your best during those hours. Focus on solving problems, and avoid distractions like social media.

Most good engineers are happy with this arrangement.