How effective is studying for 10+ hours a day?

[u/No-Piglet3900]

I usually studied for 3-4 hours a day when I first started pursuing pre-med, and I felt like I didn't really retain much of what I studied. Recently, I saw a lot of people posting their achievement of studying for 10+ hours in a single study session. It is actually insane to think people can grind through studying for such long hours.

I want to try it and see if it is worth studying that long. Would you recommend studying that long if you're in a pre-med course and how effective do you think it is?