I’m not sure I get all the “wow that’s so much bigger than I thought” million and billion comparisons.
A billion is one thousand times bigger than a million.
One minute to walk the length of a stack of a million dollar bills.
1000 minutes’ walking (16.66 hours) for a billion bills
To do it in 75 minutes you need to be going 13.333 times as.fast as walking pace.
Let’s say walking pace is 3mph, so it would take about 75 minutes at pretty much 40mph.
And…?
(No I did not watch any of the video. Why don’t people know what a thousand times as big means? Maybe I’m having a bad day.)
Now, if we were using the old British definition of a billion - a MILLION million … 
