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"Word" is not a unit of time. The same number of words takes different amounts of time to be spoken by different people, and even to be spoken by the same person if he's rested or tired, interested in the words or not, etc.
The widths all average out the same ... 15 degrees of longitude per time zone. The shapes are drawn the way they are in order to avoid splitting cities and states into two different time zones.
There is no single answer. Everyone is different, and even the same person can last different amounts of time.
Different batteries have different capacities, and will therefore store a different amount of energy - and require a different power if you want to charge them in the same time.
Length and volume are not the same, any more than time and mass are the same. They are different properties that are measured with different units.A cube that has a height and length and width of one unit will have a volume of one cubic unit, but that does not mean that it is correct to say that its length and volume are the same. Saying that is like saying that an hour weighs the same as a kilogram.