Northside's classes run on a block schedule. Classes meet twice a week: on Mondays and Thursdays or Tuesdays and Fridays. The school day used to start at 8:16 a.m. and ended at 3:30 p.m. until the 2014–15 school year when the school day at Northside now starts at 8:00 a.m. and now ends at 3:04 p.m. (except for Colloquium schedule where it ends at 3:01 p.m.). Each block is 100 minutes long with an 8 minute passing period between blocks. Wednesdays are reserved for an approximately three-hour non-credit class on five-day weeks called Colloquium. Dozens of colloquia are offered, with a wide range of interest such as motorcycle repair, computers, robotics, consumer-education, sewing, quilting, art, photography, paper craft, and Asian calligraphy, and each relates to one specific theme that changes every year. Classes are chosen by students twice a year (every semester, or otherwise it is year-long); availability is dependent on popularity and student's year ranking: seniors get first pick, then juniors, sophomores, and lastly freshmen; all of this is done online, through sound programming, with student portals opening at 7 am for students to start registering. There are different dates for different year students. These are the only classes in which students either pass or fail. Colloquium clubs vary from year to year.