For us, it was about a decade+.
You will need help to stay grounded. Hopefully, the job doesn’t all fall on you.
Develop a network of family/friends you can rely on.
No its not all on me. She is in independent li ing right now. I do welfare checks 4 days a week or so and take her to church, run errands. That is not a whole lot compared to what others like yourself it sounds have had to do, so i bet i am getting off easy. As she gets worse it will be assisted living then the dementia ward. Theres is a legal battle going on over her that has been the most taxing. It will end hopefully by end of year.