Drawing from his own experience in the tech industry, Sidney shared that some years he spent virtually all his time working, while his second year of grad school was mostly spent playing video games. The ideal, he told the graduates, lies somewhere in between — and that balance is different for every person. He warned that no matter how much you accomplish, if all you ever do is work, you will look back with regret. Playtime, family time, and sleep are not luxuries but necessities — for recharging, for gaining perspective on what your life means, and for getting good ideas about the future.