Why are the walkers taking so long?
Maybe they can't walk during the day or something. Plus, I'm not really sure where they're getting any energy from. I mean, sure. They're dead people driven by some magical force to serve a purpose which requires a lot of walking and energy expenditure. But this force cannot move them the way they do. You can clearly see the movements are very instant and there is no lag time which means there isn't any communication or transfer or force going on. These white walkers are clearly independent creatures who move on their own free will.
But there is so much energy that would go into that much walking. They need a lot of energy to cover that much ground, especially considering the weather and irregular surfaces they are marching across. Let's take for example The Wall. It is 300 miles long, according to wiki
http://gameofthrones.wikia.com/wiki/The_Wall
Now, let's say they only have to walk the length of it. The reality is that they are marching from much further away. And how many walking dead are there? I can find no answer to that. The image below is the most official thing I could find regarding the amount of zombies in the army.
So let's go with a conservative estimate of 500,000. That would be about five of Penn State's football stadium and that seemed like a lot of people at once. Let's go with an average of 180lbs per person. I know the people in there are mostly bony but this takes into account the three giant motherfuckers in the army. Anyways, the average 180lbs person burns 100 calories per mile by walking. That seems kinda low, keep that in mind ladies and gents. Weight isn't lost in the gym, it's lost in the kitchen.
But these guys don't have all the functioning organs and abiities of a full human. So let's go with 50 calories a mile. So then, the amount of calories(50), times the amount of people (500,000) equals 25 million calories! Per mile. 25 million times 300 miles equals 7.5 billion calories. For this army just to walk across the wall. Now to feed that many mouths, you would need a shitload of food. I was trying to look up the caloric amounts for an entire cow and according to myfitnesspal, they're pretty low.
I don't believe that estimate so more research led to me finding out the average percentage of usable meat you get from a cow (
http://www.meatchris.com/blog/2012/6/1/how-much-meat-will-i-take-home.html) and to the average amount a cow weighs, which google says is 1,600 lbs for female cattle. So given the percentages in the table at the first link, we get (1,600*.61)*.67 = 654 lbs. There are 1,137 calories per pound in beef. That means 617,391 calories per cow in usable meat.
So that means to feed that army for the duration of the walk, you would need (7,500,000,000 divided by 617,391) = 11,338 fully grown cows by FDA/USDA standards. The average length of said cow seems to be a little over two meters judging by the pic below.
http://rubber-cow-mat.com/hp5906/Wide-cubicles.htm
Let's go with 2 meters to make this easy. 300 miles is pretty much 500 kilometers, aka 500,000 meters And from the numbers above, we have 11,338 cows. That is a cow every 45 meters. Does that sound reasonable? I do not know. But I feel like that is a lot of cows. And keep in mind, this is for only 500,000 people which was a pretty conservative estimate from me. There are more likely millions in the army.
Now my question is, where are all these fucking cows coming from? There is no way there would be that many of them north of the Wall. The terrafirma seems very harsh and the weather even more so.
I just don't buy it!
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Oh, so the original question was why are the walkers taking so long. Because due to the lack of cows or calories available, they most likely have to hunt while they march. They don't have any food reserves that they can bring along.
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