Here is some unexpected news from Polo Field! Club Penguin is decreasing the task times to be the Ultimate Puffle Expert from 18 hours down to 6 hours.
I may be wrong, but it could partially be influenced due to the bugs where tasks were getting reset or 18 hours passed and it wouldn’t let them do the task. The change will probably take place tonight when the game is updated. This means you can complete them all in 24 hours minimum, assuming you log on every 6 hours.