Dear Brother Lonnie, there used to be instructions posted somewhere with instructions I can no longer find, but if I remember correctly there was a 10,000 character limit per post, and that may have included spacing also.
To exceed that limit produces an error, and advises to shorten the post.
One way to post a longer subject is to divide a subject into different parts as I did with the following thread. On my Windows 10 Pro under Review on the header there is a Word Count. I posted approximately 8900 characters on Part One, while attempting to divide the remaining two parts to end and keep different parts somewhat in context with an idea started. Hope this helps.