A text message part can consist of up to 640 characters of text.
You can also add up to 13 quick replies, or 3 buttons to a text part.
If you have added quick replies to the text part, and the text part is NOT the last part in the message, the quick replies won’t be visible.
The text should not be too dense – break it up into small chunks of a few sentences with a short delay in between. We recommend for long chunks of text to add a delay of 500ms per line of text.