I’ve been curious about this question for pretty long. I’m not in academia, but I heard from my friends who are in PhD programs talk about not wanting to take a vacation or ask for vacation approval, fearing that it will hurt their advisors’ evaluation on them. As far as I know, they’re very hardworking and dedicated people (with no problem to work overtime, on weekends, on call etc) who aim to publish as many high quality papers as possible, but it seems a little bizarre for me to understand, if taking a vacation really shows sign of tardiness in academia? And would that hurt their publishing speed (sorry I can’t think of a better word to describe what they want)?
I apologize in advance if this question is off-topic, please suggest anything to improve my question/vote for close if it’s the case.