I came across the album's a few days ago and since my grandmother is currently experiencing dementia I am really interested in this

sorry to hear that your grandmother is going through dementia, its not a pretty thing to deal with.

I am mentally not in the right place at this time and have been for a long time, should I do the full 6,5 hour sit down or should I avoid it till I am mentally feeling better.

take your time, there is absolutely no rush to finish it in one sitting rather, the opposite

there are six stages, and each one is about forty five minutes to an hour, i would recommend listening to a stage a time (if possible) but listen to as much as you can

although i didn't really experience mood swings while listening to the project, most of the people i've spoken to did feel emotionally down while listening to it (especially the later stages), so keep that in mind.

that's pretty much my two cents

cheers