Regarding black holes , theoretically if you were to pass the event horizon how long would it?

it depending on the size of the black hole. if its a stellar mass black hole you might get stretched like a rubber band and die in a matter of seconds because of the gravitational forces, if its a super massive black hole at first you wont feel anything different after you pass the event horizon, because the event horizon of a super massive black hole is much father away from the singularity. in any case you wont notice any difference to the local passage of time, but a distant observer will see you get slower and slower, and red shifted when you get closer to the Event horizon, just before you pass the event horizon light emitting from you will be extremely red shifted and dim the observer will be unable to see you any longer.