You're also going to be making your own schedule. When building your class schedule, keep your habits in mind so you'll be successful long term each semester. I highly recommend you utilize your university's student advisors for help in building your schedule.
Compared to high school, you will spend a lot less time actually in class, but it's important to remember that you still need to do work outside of class and that's not all "free" time. I recommend finding a routine that works for you to complete work outside of class and stick with it - whether that means taking the time between classes to work on homework or take that time to workout/catch up with friends/etc and do homework after classes end for the day. Also, in college there will probably be less graded homework assignments, but I highly recommend doing all readings/assignments (even if the professor doesn't check them) otherwise you may fall behind fast and it can be hard to catch up.
College takes a lot of self-disciple to make sure you are balancing your time and completing everything you need to, but once you get into a routine it will come naturally. Good luck!