The maximum length of a voice message in Messenger is one minute. The app displays how long you’ve been talking, so you can keep track of your message's duration. After one minute, the app will make a sound, and the recording will automatically stop. You can then choose to send it or delete it and record a new message if you aren’t satisfied. Although this may be convenient for some, others may consider it too short. Fortunately, Messenger doesn’t limit the number of voice messages you can record and send to someone.