Here's an example of what I feel is the limit for a sentence. I wrote it long then condensed it: "I am sent to upgrade your understanding, to enlist your cooperation in bringing a shift in human consciousness by ending individual reliance upon energy provisioned by a small oligarchy."
That sentence was eleven words longer until edited. Editing is the work part of writing, unless You write things like South Pacific.
unless You write things like South Pacific.In which case your last name is Michener.
Unless of course you're in a more musical mood. In that case you're either Rodgers or Hammerstein.. ;-)