Welcome to UCSD, Kalak and BjOrKnRaDiOhEaD. The amt of free time in the weekend depends on how much work you do during the week. The good thing is that materials do increase (I should know since finals are next week). Initially for the first 2 quarters I've gone out about once per week, as hanging out is important for me. Now sometimes I find myself studying on Fridays and/or Satursdays, which only happened for me during the finals back in undergrad. The bottom line is learning the materials and pass all the tests. If you have any more questions, more of my classmates and I will be happy to answer them after the finals.
cheers,
Z.