Basically, James did a study on headlines to determine how long a headline should be. Here is what he says:
The results were surprising. The average sales page has a headline of only 10 words comprising 55 characters. The profitable sales pages had an average of 14 words and 82 characters in their headlines.
He explains a few more details of his study and then concludes:
That is my new recommendation. I intend to only use headlines that are at least 80 characters long and no longer than 131 characters and I advise the same to my clients.
This was a revelation to me.
You see, I had been typing in headlines much longer than 131 characters. Why? Because it seemed that I could get a higher score in Glyphius by adding more words.
Well, that is not exactly a good idea. Because the results of James's study show that the majority of profitable headlines are no longer than 131 characters.
One version of Glyphius has a headline filter that automatically applies these character limits. If you are writing a headline, make sure you use the headline filter.
If you have a version that doesn't have the headline filter, just make sure your headlines stay within the character limits supported by the study.