Yra

Here is the path:

developer> forms> field> system> comment post form> text> edit field > data length Max value.

However that is already set to 40000.

And still when a reply comment is made in discussion, we are getting a red warning which states

Please enter 1-5000 characters.

UNA is ignoring the 40000 input at the edit fields dialog box

There must be another place where this can adjusted