The character limit for answers and questions(?) is 30,000 characters. This is a pretty huge block of text and good answers, howsoever detailed, are not expected to reach such lengths. The same extends for questions. Hence, there really is no need to display it on the questions or answers page.
In fact, the number of posts longer than 1.5k on MSO is pretty small, with even fewer reaching the character limit. I have taken the example of MSO, as posts tend to be generally longer here than on other sites.
In the case of About Me's, the trend is similar. In fact, it is even more compacted with no post(?) exceeding 5600 characters.
