If you put one million people behind eachother in a line, and you count 30cm of space for each person (and that's close! belly-to-bottom close), you have a line of 300km. If you put 3 million people in a line, it's 900km. Distance from Cairo to border of Israel (I used google maps) is only 300km. So I guess when the Israelites were traveling, it was a very very broad line if they wanted to prevent sticking their noses into the promised land before the 40 years were over.
Let's say that the israelites were very slowly and only traveled 10km a day, they would've made it in 30 days, not 40 years.
Let's say that each Israelite family (only two children, a man and a wife, making 2.4 million israelites) have a tent to spend the night in. A tiny tent, measuring only 2 by 2 meters. And there was no space between the tents. The camp site would be 2,400 square kilometers in size (926 square miles, or 593 acres), measuring about 48 kilometers on each side. And that's not taking in account possessions, livestock, servants, families with more children than two. Almost as large as Rhode Island (1,214 square miles).
At the slow rate the Israelites must've traveled (10km a day) it would have taken 5 days to travel from one side of the campsite to the other side of the campsite. Now if you lived in the middle of the camp, and you had to take a dump, you would have to travel 48 kilometers roundtrip to take a dump. So taking a dump would've taken almost 5 days, 2.4 days to reach the edge of the camp, and 2.4 days back.
No wonder it took 40 years, they lost so much time going to the toilet!
Now let's say that the Israelites have all set up their tens, spent 5 days taking a shit and now they want to sit down and eat. An average person consumes 2500 kilocalories a day. Let's say the manna was very efficient, as good as sugar, and contained 400 calories per 100 gram. That means that a total amount of 625 grams of manna was consumed by each person. To feed 2.4 million israelites, it had to rain 1.5 million kilos or 3 million pounds of manna EVERY DAY. Now let's say all of those 3 million pounds pass the human digestive tract and becomes shit. For the total of 40 years, an amount of 43.8 BILLION pounds of shit have been crapped out by the Israelites. I'm starting to wonder why the Sinai isn't a brown desert. And because it took 5 days to take a dump, the turds would've been over 6 pounds each. Now those are large turds. Why haven't we found any? And remember, we are still not talking about livestock, and they have to crap too.
It takes about 4 ton of manure to fertilize an acre. 43.8 billion pounds translates to 20 million tons. So in those 40 years, the Israelites crapped enough to fertilize 5 million acres of farmland. The Sinai desert is about 15 million acres large, so the Israelites converted about a third of the desert to well-fertilized farmland.
We all know why Moses couldn't enter the promised land, because he was arrogant when springing water from rocks. An average person should drink about 2 liters of water each day. So the river that Moses generated would have had a flow rate of at least 4.8 million liters of water a day (that's 1.2 million gallons). That's a lot of piss too! There are 86,400 seconds in each day, that boils down to 55 liters per second. I wonder if that sudden large uptake of water in the Sinai desert caused any climate change, plants sprouting etc. etc. In the total of 40 years, 70 billion liters of water were consumed by the Israelites. That must've had some effect that we could still be seeing today.