The newly redesigned Leighton School MBA is faster, shorter, and better than ever, making it even more attractive for busy, ambitious working professionals like you. Choosing to pursue a Leighton School MBA is a smart business decision. Courses offered in a hybrid format: 50 percent in-class/50 percent on-line, increasing flexibility and limiting the time our students spend on campus. Full-time students carrying 9 credits a semester can complete MBA degree in 18-24 months. There are two eight-week sessions per semester. Classes meet weekday evenings.