It turns out that the answer may depend upon your attitude toward the specific blog post.
According to the Miriam Webster site where I’ve been enjoying the vocabulary quizzes, “long” is an impersonal measurement, while “lengthy” often has negative connotations.
But let’s begin at the beginning…
“Long” is often used in reference to the length, width, depth, or height of a physical item. For instance, long hair.
We might also refer to time and say that a person has a long history of community service, or someone who has been in business for 40 years has had a long career.
The word “lengthy” seems to suggest an unwelcome excess, as in a lengthy wait in line or a lengthy 
illness. You might have to fill out a lengthy application form – and our tax returns can certainly become lengthy. “Lengthy” seems to be connected to a feeling of tediousness.
Of course, “long” can also be used in place of “lengthy,” and often is. Some would say a long wait or a long illness.
We just don’t turn it around and say that “Mary Jane has lengthy hair.” We also never describe anything as "widthy" or "heighty."
So, if a long blog post gets tedious; if it seems to go on and on and on; or if you can’t force yourself to read to the end, you might say it was lengthy. Some would even say “too lengthy for my taste.”
If it’s a nice, fast, moving-right-along read, you’ll say “This was long, but worth it.”
Are YOUR 3,000 word blog posts long, or are they lengthy?
Image courtesy of David Castillo Dominici at FreeDigitalPhotos.net
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