For grad students who want a research career

Following my last post regarding how to get invited to give talks as a graduate student, a commenter asked:How many days-spent-at-seminar talks+conferences/year is a good number for a grad student interested in a career in research? Obviously it depends on a whole bunch of factors, but just wondering what your best generalized estimate would be.This is a great question. I may even rephrase it to be, "If I want a research career, what are some good...