In "Ice Cream Scream" the ice cream man said it took 5 hours and 33 minutes to count $16 worth of pennies. This means he was counting at a rate of 4.8 pennies per minute.
It's the Ice Cream Man's own fault his life fell apart; the chain reaction aside. He was WAY too slow to count the pennies, plus being too dumb to simply put down the change jar for a moment to tie his shoe.
It seems HEAVILY ridiculous how Dexter and his friends DONT attempt to leave the Darbie convention nor pay attention to the fact there was TWO conventions going on.
This episode shows the rare occurrence where a kid's perception of reality can be warped by television. The kid pretending to be a Star Trek medical officer thinks a toy is someone in suspended animation.