I don't know what you mean.
"Characters" don't have a length. The actual number of bytes taken by a character in a string is dependent on the coded character set (unicode, latin-1, ascii...) and encoding (for unicode, these include utf-8, utf-16, ucs-2 and ucs-4)
Under utf-8, the first 127 characters take up 1 byte, and higer numbered characters take a variable number of bytes (I'm not sure about the exact encoding, but IIRC it can take up to 4 bytes under the current unicode set). Under ascii and latin-1 all characters are encoded using 1 byte (8 bits). Under ucs-2 all characters take 2 bytes, and under ucs-4 all characters take 4 bytes.
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