As a 1L I thought some nights were difficult in terms of the amount of reading, but it's not as ridiculous as you've probably heard. It gets a little more in that direction during exams, but as long as you're on top of things you'll survive.
But I'm only first year. The other person's answer might be more useful. The mantra, if you haven't heard, is "scare you to death, work you to death, bore you to death." From what I understand 2L is a busier year if you're doing things right (more opportunities, such as journals, intern/externships, jobs continuing from the summer, etc.).