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I heard that the Earth rotation is slowing down, but I also heard the Earth's length of day is increasing.

Does the two theories go together or conflict with each other?

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Yeah, question about Earth is totally too localized –  user11153 Jan 7 at 10:59
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closed as too localized by Qmechanic Jan 3 '13 at 15:17

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up vote 9 down vote accepted

If you slow down, it will take you longer to type a sentence, won't it?

When the Earth slows down (i.e. the speed of rotation is decreasing), it will take longer to complete a rotation, so the day is longer (i.e. the length is increasing).

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