The worst fear I have isn't about being dead, but about the process: how long does it takes and what someone feels during all that time? Reading that it's poss

The worst fear I have isn't about being dead, but about the process: how long does it takes and what someone feels during all that time? Reading that it's possible to keep some cells in that intermediate stage gives me shivers. I know that hair and nails can keep growing for some while (hey, I'm just a bunch of cells that keep living while others have gone), but when we come to the point that brain cells can be kept alive in a petri dish... Will this make me kind of conciously still alive?