Do people take time out to go home, meet with family etc. during their PhD?
If yes then for how long and how frequently is it usually?
How does one deal with this with one's advisor?
What are the pros and cons?
Given that one basically has just about 2-3 years in practice to do all their PhD work, I don't understand how anything else fits in the schedule except work. The entire idea of a PhD looks quite scary to me that one is expected to produce cutting-edge stuff in that short a time starting from just standard graduate courses!
PS: the question is general, but if it is field-dependent, I am interested in particular in physics PhDs (theoretical high-energy physics specifically)