The biggest thing I noticed when starting my PhD was all the first and second years derping around not doing much, all the third years panicking and "just getting going" and all the 4th and 5th years really grinding. So, I inverted that and worked my ass off like I was still an undergrad in the first 18 months, toned it down for the next year and submitted my thesis at 2 years 10 months (the earliest my university wo…
As Xaa mentioned for NIH, there are clocks that start ticking after your PhD. This is true for other funding agencies as well. Also, when it's time to start hiring faculty, the fact that someone took 3 years vs 7 years for their PhD is not as important as their publication record and their plans for future research. We recently brought on a guy with 80+ publications (with a large number of those high impact) during his PhD and one postdoc.
I think "rushing" to finish isn't a worthwhile goal (even though I will admit that when I was a student, the stipend was horribly low, so there was a huge opportunity cost for those who decided to do something else later). Being productive during your time is worthwhile. Asking yourself if you are still being productive or if it's time to move on is productive. Not being a technician during your PhD is worthwhile. In that sense, the article has some good advice about taking time out to think. But, in some fields you sometimes just have to grind it out. Say for example, someone is doing an x-ray experiment at a synchotron, or doing MBE synthesis, there are times you just have to put in the hours to get results.