TLDR: I've never been in this situation before and I don't want me changing my last day at the last minute to come back to bite me in the future.
I work for an absolutely terrible company, and I have taken a job at what I hope will be a better company. I gave my current employer two and a half weeks because that's how long it was until my start date with the new company. I have now entered my last week, and today was probably one of the worst days I have ever had at this company. I have been treated like shit by my boss because I'm leaving, I found out because my boss is an idiot that my replacement will be starting at a higher salary than me even though I have been with the company for nearly six years, and I just cannot take this anymore. I am worried that if I ever need references in the future to vouch for my experience, that because I change my last day, even though it is the customary two weeks, that it will somehow come back to bite me in the future. I was going to ask other people not directly linked to me to be future references, but I've never been in this situation before.
My mental health is starting to take a hit, and I am already worried that this big of a change might trigger a manic episode. I know from my experience that big changes from my routine are a trigger. I just do NOT want to give them two extra days because they just don't fucking deserve it.
I am literally the only person who knows all of the systems that are in place for my position, because I was the first person to actually have this job, and they want me to train my replacement before I go, but she won't be there until Thursday or Friday, because they're idiots and they dragged their feet to hire someone new.
Another thought I've had is that it would be really nice to have a nice four day weekend to relax, because I have been full steam these past couple weeks, even putting in overtime to stay on top of things, and write down notes for my replacement.
I'm sorry that this is long winded, I've just never been in this situation before and I don't want me changing my last day at the last minute to come back to bite me in the future.