PhD in Biology: how time consuming? I am currently pursuing my master's in bio-medicine. I am taking classes, doing research, and working as a graduate assistant at the same time. So far it has turned out to be very time consuming. I can do the work just fine, but I am having trouble finding any time to spend with my family. I was originally planning to continue with a PhD in bio-medicine after graduating with my master's.

Question
In your experience doing research in a bio-medical PhD program, were you required to spend all of your time working?
Is it possible/likely for me to enter a PhD program that allows me to treat it as a full-time or even overtime job?
Through undergraduate and now in my masters I spend pretty much all of my waking hours working, and I don't think I'm interested in another 4-5 years of this.

Edit: I am in the United States. My goal in getting a PhD is to teach at a university level, but I'm open to research or industry jobs as well.
The answer is, of course, that it depends. If you're in the US the first two years are functionally two jobs - classes &amp; candidacy, and research. I think most people end up working a lot. If you're continuing in the same program as your masters degree it will be less time consuming because you've already knocked off your course load, but it's not going to be much better than what you've already experienced.
It's also very PI dependant. Some PIs will be fine with something close to a 9-5. Others will expect an 80 hour a week workload. You should be careful with who you choose to work for. I would advise looking for associate or recently promoted full professors with children under the age of 15. Labs which are entirely international students are a red flag. There's no replacement for talking to current students in an informal capacity about work life balance. Spending $20 and a night at the department happy hour is an investment that will pay off when you pump people for information.
FWIW I did 60 hours a week through my PhD but got much better at time management and got that down to 40 a week for my postdoc. It is doable.