Arden Missal and her husband, Jordan.Courtesy of Arden MissalArden Missal, a physician assistant, paid off $150,000 in student debt in 16 months.Missal worked 80-90 hours a week and cut her expenses to achieve her goal of becoming debt-free.Achieving debt freedom allowed her to start a financial blog and take a year off work.This as-told-to essay is based on a conversation with Arden Missal, a 30-year-old physician's assistant and blogger based …