Stanton,
The only "lights out" shot whether with a bow or firearm is a CNS (central nervous system) shot, meaning: A shot to the brain or a shot that severs/injures the spine somewhere forward of the shoulders.
Making that happen with a bow is not an easy thing to do. I have shot many hogs with an arrow (archery is actually my first love), and have not had to track hogs very far (usually less than 75 yds. often WELL under that).
However....I share your concern if you are hunting where the cover is thick.
No one wants to track an animal into thick brush where you can't see...and can't run.
With GOOD shot placement (very tight behind the shoulder, preferably quartering away), you won't have far to go.... to find your pig. This assumes you have a SHARP broadhead AND get good penetration.
Ideally, you want an "exit" hole on hogs and one that is low on the body (if possible). Don't be surprised if there isn't a significant blood trail for quite a ways...before getting something you can more easily follow.
Entry and Exit holes tend to plug up with fat and tissue...or the hair itself will mat with blood before dripping off. Sometimes you'll get a "pumper"...but more often you will not.
Just be confident that IF you make a GOOD shot, your hog won't be very far away. Many folks simply shoot them too far back....then YES, the hog WILL go a long way and you might never recover it.
My advice is to stay away from expanding/mechanical broadheads with hogs.
Use something of rugged construction that penetrates well. My preference for hogs is a "cut on contact" type broadhead, but other types have been used successfully.
Take TWO good flashlights with you and note the last place you saw the hog.
If you need tips on tracking, just let us know...we are happy to help.
Good luck Sir,
Flint.