The University of Wisconsin System will encourage students to graduate faster as a way to save money as some campuses seek tuition increases to improve their quality, its president said Friday. President Kevin Reilly told the Board of Regents that 29 percent of students graduate within four years, and increasing that rate would allow students to enter the work force faster and free up spots for others. A student can save $15,000 or more in tuition and room and board by graduating in four years instead of five, Reilly said, and that can be accomplished by taking 15 or more credits per semester.