My first month at college, I didn't have a job. At the end of the month, I hooked on with a dining hall job. In the time that I was not working, I was at Band Camp for a week and getting my books and courses lined up for that first semester.
From that time on, I worked at least one job (and sometimes up to four).
I guess now that I'm officially retired from both teaching and the DJ work, and I haven't recorded any audio books in a couple of years, the answer would have to be about 18 months.