At the big law firm that I worked before I got married, I was so burnt out within a year that I was looking for a way out. I finally turned in my resignation and gave them my two weeks' notice. Then I went in the following day, went to HR and told them I was taking my 2 weeks' vacation.
Yeah, I burned some bridges with that, but the law firm hit some serious financial problems and formally dissolved a few years ago. So no way to check on my employment with them now. Whew, dodged a bullet there.