EDIT 7th April, 2012: Corrected a large error in mug's size I found.
Time taken: 10 - 16 hours.
The small apparent errors in multiplication are not mistakes; they include multiplied fractions that were not shown earlier due to rounding.
PROBABILITY TRIVIA: Assuming a population of 3,650, if you walked around Ponyville and managed to meet 100 ponies every day, then after a week you would have a 68.4% chance of meeting at least one of the Mane 6. You would have to meet at least 1,400 ponies if you wanted for that probability to be bigger than 90%.