Twilio allows up to 180 characters for a single message to be sent. If a message contains more than 180 characters, the rest of the characters after the 180th will be split into another segment of 180 characters. This will consume more SMS credits. So it would be best if you could make sure that your messages don't reach that limit, only unless you intend to do so.
Tip: Make sure that your shortner (Bitly, Rebrandly or TinyURL) is set up properly and is working. If your shortner is not working, your links may end up being fully displayed which takes up much more characters.