one and a half days. Taken on as a trainee. Got talking to the people that had been there for 5 years and were still doing the same job as on day one, realised there was no potential to do anything different and didn’t go back after lunch on day two.
Also did a week at one place. Engineering company which initially looked like it had promise and would be interesting but the job turned out to be mostly putting stuff in the CNC lathe, watching it for a bit, then taking it out and deburring it. That was the job that made me decide to back to college/uni and have a proper go at getting some qualifications.
longest time is around 8 years which I’ve done a couple of times.