The new general rule about the minimum length for content is 300 words. There is a belief that Google is not paying much attention to new articles that are less than 300 words, but I have not yet thoroughly tested that. I therefore do not know if it is true or not.
300 words is not hard to write and it is a reasonable expectation for quality content. The new best practices rule that I tout with clients is 300 to 600 words.
"Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote." -- Benjamin Franklin