Wastes of Time
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Sort Grains of Rice
Time: 1-? hours. Try this with 10lbs of rice.
Memorize Every Barcode Number in a Grocery Store
Time: 1-? years. Thousands of barcodes...perfect for wasting time.
Solve a Rubik's Cube from Every Possible Starting Permutation
Time: 1-∞ years. ~45 quintillion possibilities. Good luck.