http://beta.glitch.com/achievements/numismatizer_dragon_class/
"Collected 100 coins a day for 17 game days in a row"
Playing for 17 game days in a row would require being awake for approximately 68 hours.....
Do they have to be consecutive game days, because if so, I think someone didn't think it through all the way. We wouldn't be very coherent after 60h awake!