A core tenet of Bay’s philosophy is that we seek to help students become careful stewards of time. The importance of time and sustained attention is reflected in the design of our academic schedule in which students take four full-credit courses each term, with more minutes spent in each class. The school year at Bay is divided into trimesters; each is 12 weeks in length. Classes meet four times per week, 80 minutes per meeting. Over the course of a year, each student completes 12 trimester-long courses, each worth 0.5 credits.

The long-block trimester schedule affords a number of distinct advantages over a more traditional schedule with (for example) 50-minute periods, seven periods per day, and two semesters per year. Over two trimesters (the length of a full-credit class), a course at Bay will meet more than 80 times, surpassing the total instruction time available in year-long courses in most semester-based schedules.. Longer blocks allow for the incorporation of in-depth lessons and activities such as labs, field trips, student-initiated projects, in-class writing and research, and extended discussions. Fewer classes mean less time lost in transition between one class and the next. Teachers work with fewer students per day, allowing them to work in depth with their students on an individual basis. Students are able to better concentrate their efforts on fewer subjects at a time, affording greater depth of thought in each course.The block schedule also incorporates time dedicated for conferences between students and their advisors, club meetings, monitored study hall, free social time, and tutorials with individual teachers.