[Plugin: Polylang] excerpts too long when not in english

Please clarify, so somebody can answer your question:
What is your other language?
Do you use automatic excerpts and how do you generate them?

Thanks fror responding
the other language is greek
i use the excerpts option in the graphene theme
i also noticed that when i paste a translation from google translate after i edit it to make the translation better the excerpt of the post tends to get smaller but again nowhere near the normal 55 words, i wanted to test an other text style but for the time being my page is down (server problems)

You should ask the developer of Graphene theme about this, because Polylang does not modify excerpt length.

One reason could be that the theme splits words incorrectly because Greek is entirely multi-byte character language, but that is just an assumption.