The Bachelor of Science in Nursing (BSN) typically takes four years to complete, assuming the student is enrolled in a full-time program. However, the duration of the program can vary depending on the specific requirements of the school and the student's academic background. Some schools offer accelerated BSN programs that can be completed in as little as 12 to 18 months, while others may offer part-time or online options that can take longer. It's important to research different BSN programs and their requirements to determine the most appropriate option for your individual needs and goals.