Don't! If it means millenium, then we might be encased in rock if we do that!
Hmm... maybe you're right. I don't think the topography would change that
much in 1000 years. I would guess that without a stream nearby, the elevation wouldn't change by more than 10 feet or so in either direction. We might be buried, or more likely have the ground suddenly a few feet below what we were standing on but we probably would not be encased in rock. A tree having grown in the middle of us could be a serious problem, though. Also, if there are humans, or Khajiit, or someone modifying the surroundings, anything could happen in 1000 years.
Of course "Mil" could just as easily mean "million," then we'd be super screwed. In a million years, pretty much anything could happen.
New possibility! We could head towards the stream. Follow the stream to an ocean or large lake. Swim out to sea a ways. Then we should be able to experiment with larger time jumps. If the sea level changes, we'll either find ourselves underwater, and we could just swim up to the surface, or we'll find ourselves above the surface of the water, and we'll fall safely into the sea, where the water should break our fall. "Mil" being a million years would still be a problem, though.
Also, experiment if we can take anything with us. Grab a rock. Go forward in time 15 mins. See if we are still holding the rock.