What is the maximum length someone can leave a voicemail? April 29, 2022 20:14 Updated The maximum amount of duration for a voicemail is 5 minutes or 300 seconds. Learn more in the following article: Minute usage calculation Related articles Does the length of a voicemail count toward my minutes? Do I Own My Phone Number? Add/update my voicemail greeting Minute usage calculation How to port a number to AT&T Wireless Comments 0 comments Please sign in to leave a comment.