The first text message was sent in 1992 from Neil Papworth, a former developer at Sema Group Telecoms. Mobile phones didn’t have keyboards at the time, so Papworth had to type the message on a PC. Papworth’s text — “Merry Christmas” — was successfully sent to Richard Jarvis at Vodafone. http://mashable.com/2012/09/21/text-messaging-history/#7WcM8gVdbZqj
A two-word message was the first text message and is a good general guide for how long your messages should be. Texting a novel is NOT a good idea. It is hard to read. Punctuation is an afterthought. Grammar rules are ignored. There is no tone in text messages.
A text message novel is a mere paragraph in an email. In an email form it is not daunting or harassing. In text form it is over the top. Send short texts. Save the longer messages for an email or even a letter.
Matthew Thompson is a Family Law Attorney in Mississippi and reminds you to avoid sending a novel length text message.