Hours of studying and limit for burnout?

Current 1st year. How many hours a day / week do you all study? And what do you all think is your limit after which you feel burnt out? I'm trying to find the right balance for this. Currently, I'll go hard for one exam but then get burnout and not care much about the exam later that week. Our curriculum has around 2 exams a week.
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Medical Students - MD Source Type: forums