Knowing I'd die from the physical exertion of running three steps, I thought I'd look up typical track sprints. The longest short distance I found was 400m with the shortest midrange distance being 800m. I had picked 500 yards or about 470m.
Again, I'm prejudiced by my lack of physical ability, but does anyone else think 500 yards is just too darn long of a run? I need it long enough to be a challenge, but the runner isn't an Olympic track guy either. That's 5 football fields. Too much, not enough, just right? What do ya think?
The sand is going to make it a bit more difficult. With that factored in, I might have to stop and take a couple of deep breaths now and then, and I'd probably have a couple of falls on the way.
The desert I'm using is all hardpan but the guy is in boots, not running shoes.
Now I'm worried it isn't long enough. It's all about timing what the protagonist is doing with what is going on elsewhere.
Do you know how long it should take your MC to reach the other side? If you do, you can calculate the distance by multiplying the time by a reasonable speed, depending on how in shape your character is. FYI, make sure the units match up.
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The desert I'm using is all hardpan but the guy is in boots, not running shoes.
You could have him lose the boots and go barefoot.
The reason I ask is because you are very close to a quarter mile. (440) which might make for a dramatic sentence. "You must run this quarter mile and survive." etc.
Two minutes for a quarter mile is 7.5 MPH. This is the pace I can run a few miles at any given time. I'm 6' with a big stride and years of practice.
In elementary school, they had us run the 440 occasionally. With no warm up and only running around the playground and playing at home I was able to finish the race every time without stopping. However, toward the end my lungs would BURN because of said lack of warm up. I recommend factoring this in.
Only the most out of shape kids with zero motivation stopped along the route. Some were pretty slow, but they finished without dragging. If there were scorpions, etc on the ground I bet every kid would have finished. Boots or sneakers.
Thus, I'd say your guy would have no trouble finishing this distance in heavy boots in the hot sun under peril of flesh chomping, but he's going to be pretty wasted by the time he's done. If there's a finish line to cross into safety he'll totally collapse until the fire in his lungs subsides.
Axe
If your character needs to outrun some beasties that would chase him during the gauntlet, you can make the guantlet as long as you want, and simply make the beasties too slow to catch someone going at the right speed, but fast enough to catch someone who is too slow. For instance, it could be 150 miles, and the person has to do it without sleeping because if they stop and rest, the monsters will catch them. That would be just as grueling (if not more) than a sprint. So it all depends on the type of challenge you need...
there is the Iron Man triatholon where one swims 2.6, miles, bicycles 250 miles, then runs 26 miles and have about twelve hours to do it. Most make it in time.
AS said before, farther you have to run, he slower you will run. You could run in a fast sprint and then slow down as you go farther, but the overall speed will be lower than if you ran the first part properly as you will already be tired.
There were several tribes that had children run through a gauntlet where the adults whipped them with switches as they ran between them.
The training of the person makes a big difference. Yesterday, I walked less than four miles with rests half way through and that was all I could handle. I could not do half that today because my body took enough abuse for the week.
I might run a hundred feet but not run farther.
On the other hand, someone who hiked with equipment or packs regularly, and did a lot of running, would not have problems with the guantlet you are discussing. They may be wasted at the end, but they would be able to cover the distance I could never pass.
I'm a sprinter (read: no stamina whatsoever) and I can definitely tell you that adrenaline (outracing someone vs. timed sprints) increases my speed incredibly. So adrenaline will probably get your MC through it okay, unless you write your MC as completely out-of-shape, overweight, ill, or something similar (in which case I suspect your MC would be dead long ago). But your MC might collapse on the other side (I sprint myself into the ground on a frequent basis) and need to rest for a few minutes and guzzle some serious water to get over the aftereffects.
Also, not to TMI, but sprinting past your endurance levels in serious heat will probably make your MC puke.