Putting in a few long days isn't what the author is talking about. It's doable to be really productive by putting in a ton of hours in a short span of time, li

Putting in a few long days isn't what the author is talking about. It's doable to be really productive by putting in a ton of hours in a short span of time, like, for a couple of days. But try doing this for weeks or months at a time. I put up with this at my last job for a while, but my life became a total grind. I would literally wake up in the morning while my wife was sleeping, work all day, come home and my wife was already asleep for the night. Sometimes I wouldn't talk to her for days in a row. This is not sustainable, either personally or professionally, and is what the author is cautioning against.