When looking for a word for a lengthy, tedious, boring, text*, I had the feeling that tirade could be the right one.
However I looked it up in on-line dictionaries and all of the the ones I consulted say that it's supposed to refer to an angry speech/text.
I'm not yet convinced though, I think I heard it used for what I'm looking for, in a humorous manner (and maybe the dictionaries I looked up only reported the canonical meaning).
So, can you native speakers confirm, or confute, my impression?
* I have already, unsatisfactorily, read Idiom to describe a text (or speech) which is too long.
Best Answer
If you want a word that is non-angry, long, and boring, then tirade is not it. The dictionaries aren't wrong. A tirade is given in anger.
Perhaps you're thinking of the third sense of Merriam-Webster's definition of monologue:
This has the advantage of being applicable to both speech and text.
Or, there's the verb drone:
However, this one is applicable only to speech.