Just as in Lenguage, in a Len(language, encoding) program, the length of the program is the only thing that matters. The contents can be anything the programmer wants it to be.
First, the length of the program in the given encoding is calculated. Then, said length is converted to binary, left-padded by zeroes until the binary data is valid in the given encoding, then the binary data is converted to text according to the given encoding. Finally, said text is evaluated as the given language.
Example Hello World program
and then convert it to binary using the ASCII (7-bit) encoding.
Then we would interpret that as a number in binary, (equal to 337667834225159471205607980580223574175903847313498720819759389567950249 in decimal) and then create any program we like with that many characters, such as
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa ...337667834225159471205607980580223574175903847313498720819759389567950000 characters omitted