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One girl, in particular, I was able to dissuade after three days when she was three pages in at 1,000 and I mentioned that she only had to do that 1,000 more times.
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This suggests a possibility.
At the beginning, you could say, “I have a challenge for somebody. You will get two hundred and fifty dollars if you succeed. Do I have a volunteer?” Make a show of holding up a pre-written check, or cash even.
(By the way, if the amount is too large, like a thousand bucks, they’ll know you’re not serious. It has to be small enough that it looks like you’re just barely willing to pay it out if somebody “beats the odds” and succeeds, but large enough to serve as an enticement.)
When somebody stands up, say, “If you can write out, by hand, the numbers from one to five thousand before this lecture is over, I will give you this check.” Adjust for other durations.
Anyway, whatever they manage to complete in the time period, do a quick bit of math, and show their highest number as some tiny fraction of a million, with appropriate extrapolation for how long it would take to get there.
Basically, the applicable rate is not how many numbers one is capable of writing per some time frame, but how many individual digits one can manage. In other words, it takes twice as long to write down 11 as it does to write 1.
So with a little preparatory work, you could get some baselines for reference. It takes 180 digits to write 10 to 99; 2700 digits to write 100 to 999, for a total of 2889 individual digits so far. 38,889 digits to write everything up to 9999; 488,889 to write everything up to 99,999; and 5,888,890 total digits to write down everything from 1 to 1,000,000. Assuming an insanely fast and basically unsustainable rate of two digits per second, that’s (scribble scribble scribble) about 34 days. The reality, of course, will be far longer.
This gives you an easy laugh throughout the presentation. At various intervals, you could check in with your erstwhile volunteer. “Hey, there, Steve, how you doing? Three oh six, man, you’re gonna need to step it up there, Steve-O. Come on, folks, let’s give him some encouragement, he looks like he’s getting tired. Steve-O! Steve-O!” And so on.
Anyway, finally, at the end, you could say, “Okay, in an hour, you managed to get to, what? Okay, 1497. At that rate, if you didn’t sleep, eat, or go to the bathroom, it would take you 164 days to write the numbers from one to a million. Good luck with that.”
Or, alternatively, you could ask the volunteer to suggest a target. “You definitely won’t make it to a million in an hour. Do you think you could make it to a hundred thousand? Probably not. Ten thousand? Well, give it a shot and we’ll see how you do.”
Just a thought.