Don't ask when we're hoping to finish. Research is not a course, it's a job. It's like asking, "when is your start-up's IPO?"; it makes a lot of assumptions and implies your career is a paint-by-numbers affair.
Don't even talk to us if we seem like the kind of kvetchy grad-student who bitches about having no free time. Maybe it's just that I'm at Technion instead of some American university where everyone's a careerist workaholic, but over here many grad-students do have lives, at least until we actually get into doing our thesis. We know there are no new professorships, without illusions, so we're a little less hasty to finish.
Part of being an adult in the real world is handling questions and issues that may make you uneasy or just make you say "what the hell?!?" inside your head. Your mission is to suffer the fools gladly or gently educate them, not publish missives about how special of a snowflake you are and how you should be treated.
It's a big world out there and we're all unique snowflakes.
"Landmines"? Seriously?
I don't see the problem with educating a general audience through a blog post in addition to doing so in one-and-one conversation.
You should probably qualify your statement, because I don't know what country/context you're speaking from.
That might be the case in the UK but not the U.S. 4 years is closer to a minimum here than a maximum, and some fields (e.g., history) it may be ten years or more.
And now a lesson in international academic culture.
In European-style universities, you do a Masters of Science first, followed by a PhD. The MSc might take 2 years, then the PhD another 3. This leaves you with 5 years of postgraduate studies before you're "done" (or rather, before you have to "up or out" into a new position).
In American-style universities, you do a 5-year PhD (median is more like 6 years for certain fields where actual experiments take a long time). This will involve roughly two years of coursework equivalent to an MSc, followed by a "qualifying exam" called "quals". This exam could be either a research/engineering project or a series of actual paper exams.
Quals, or passing your MSc, is a very important time in the life of a graduate student. It marks the full transition from "student" to "worker". PhD students past quals are only nominally students, and in fact will only take courses at very advanced levels of knowledge and only to help them with research. MSc/pre-quals students still have a coursework requirement, but it's already getting more research-focused and less heavy than an undergraduate course-load.
Additionally, the odds of degree completion are much better than that of an IPO. I might put successful IPO (as opposed to the desperate fund-raising kind) and a feature article in the New York Times, possibly a Nobel, on about the same level. Most doctoral candidates finish their degrees in a timely manner; most of my friends with them have had theirs since about age 29-32.
If you have lives, then I can ask when you take time off. The original article suggested there was not such time. I don't think the restriction of not talking is realistic given that the original article assumed two people would find themselves in a conversational setting with time to talk.