The time wasting site of the week is Sensible Units, a site of measurements and comparisons. Just type in any measurement to find out some equivalent units. How would you estimate 5 pounds? How about 49 golf balls, 5.5 cans of baked beans, or 3 copies of Harry Potter and the Deathly Hallows in hard cover. 1 mile is equivalent to 15 football fields, 5 Eiffel towers, and 32 Olympic swimming pools. Your 20 gallon fish tank? It holds the same volume as 13 footballs, 12 party balloons, and 4.5 average microwave ovens. As long as you can think of more things that you want to compare you can keep wasting time. I estimate that you can take it for about 10 minutes before getting too bored.