>>41325538 (OP)
I kicked the bucket a few years ago and managed to come back from it some hours later. I still have fairly vivid recollection of being "on the other side" and it's pretty much the same thing as being in a somewhat vivid dream.
This one is hard to put into words, but you won't feel the passing of time. 10 seconds, 10 hours, they feel like the same thing. It also felt extremely easy to just exist. I didn't think about it at the time, but I didn't need to breathe or exert myself in any way, and I felt remarkably at ease. I know I was dead because I was disconnected from my body, on another floor of the hospital entirely, and even got corroboration for stuff I saw while I was out of commission.
The gist is that when you die, you are still you, and it's not all that different from being alive.