The number of days in a semester can vary depending on the educational institution and the specific academic calendar. In the United States, a typical college or university semester is commonly divided into two parts: the fall semester and the spring semester. Each semester generally consists of approximately 15 to 18 weeks of instruction, excluding holidays and breaks.
In terms of the number of instructional days within a semester, it typically ranges from 70 to 85 days. This count includes weekdays when classes are held and does not include weekends, holidays, or scheduled breaks such as winter or spring vacations.