Figured out a real cool trick for Skyrim PC users.
This trick lets you rest a full day (or less) in 2 seconds, rather than waiting the standard 24 seconds.
1. Press 'T' to bring up the resting slider.
2. Slide the slider all the way to the right (for 24 hour resting) or just a little to the right (for less than 24 hours).
3. Before you release the left mouse button (from dragging the slider), hit 'ENTER' on your keyboard, then 'NUDGE' your mouse to the left, and THEN release the mouse button.
It will stop the rest sequence after 1 second, but 24 hours will have passed!
Try it outdoors for a neat time-lapse effect!
Hope this trick saves you lots of time, it sure has for me