Shortest, 1 weekend. It was the summer after highschool, and I was hired as a hostest as Denny's. I worked 6:00pm to 2:00am. Not a fun shift. I was supposed to be part time, then when the next schedule came out, I was scheduled for 40 hours and they wanted to train for as a waitress on the same shift. I quit right then and there. I explained, I wanted part time, and didn NOT want to be a waitress! Funny thing is, my first long term job after that (a few years later) was as a waitress.
And, I loved it! Hated the company but liked the job and the people I worked with. I've been working at my current job for a little over 2 years, and hopefully it will end soon.