No plural morpheme

I enjoy reading fantasy lit.  Sometimes the authors use archaic
language in the mouths of some of the characters.  I recently read one
character saying, "It's seven mile away...."

I'm trying to keep Senjecan grammar as uncluttered as possible.  I
thought that I might not use a plural morpheme if the plurality of the
noun was obvious as when, say, a number qualified the noun.

What are your experiences with this in either a natlang or your
conlang?  I believe that Japanese does this.

Charlie

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