Graduate students have to work hard; Post-Docs have to work harder.
Postdoctoral Scholar (Current Employee) – Irvine, CA – April 26, 2017
I basically went into lab for 50 hours a week, which was the minimum, and performed experiments for my professor's assigned projects in the group. Sometimes work on the weekend was necessary in order to meet deadlines for grants/reviews/etc. Don't expect a vacation as a graduate student in California. It is a full-time lab position plus you have to be a student on the side. However, if you have a fun project and can take occasional criticism, you will develop into a mature researcher and have many publications to show for it.
Tuition is paid for, plus minimal stipend for rent an groceries.
If your professor is tough, 4-6 years doing a PhD can be difficult.