38559

SOLUTION:
My table of attempts to click on ten seconds:
1. 5,862
2. 9,326
3. 8,473
4. 8,971
5. 10,985
6. 20,128
7. 19,583
8. 9,604
9. 9,838
10. 10,471

As you can see none of my results are really close to 10.000 seconds. I have tried 10 times. People are better at estimating short amount of time than long amount of time. People who have over-estimated in their first time will under-estimate the next one, because they realize their mistake and don't realize pressing the button too soon. Age doesn't really effect the result, it's all about can you count correctly. The best strategy in this exercise is counting out loud to ten.