I've experienced sleep paralysis but I'm pretty sure it only lasted for one minute at the most... it's kind of horrifying and I hate it. It happened to me a lot when I was depressed but not diagnosed yet. It would sometimes happen multiple times a night... i would have crazy dreams for 15 minutes and then "wake up" but I wasn't able to move. I would usually get over the paralysis part relatively soon, but the cycle would continue three or four times
edit: The worst part imo is not being able to breathe
it feels like there's a giant weight sitting on your chest
and yes like other people have said EVERY TIME this happens i'm laying on my back. i never sleep that way on purpose omg the whole thing is so strange