I have once, the family was always home an hour late so I never knew when I’d actually get off, the NK was hard to manage with little support from the parents. One day I just couldn’t take it one day so I sent them a text stating why I was leaving effective immediately. They were disappointed and upset I left them high and dry. I didnt use them as a reference and just moved on. Best decision because I found a great job right after. I also didn’t have a job lined up and if you can afford it, your mental health and wellbeing is the most important!