Reels: 3 minutes or 20? Two Instagram pages, one render plan

Render AI-generated Reels for 3 minutes or less. Instagram's features page says a Reel can be up to 20 minutes long, but it adds that Reels over 3 minutes will not be recommended to new audiences, and the Reels guide describes the range as 3 seconds to 3 minutes. For a Reel that has to reach people who do not follow you, the working ceiling is 180 seconds.

The two pages are not in conflict, but they are written for different readers. One describes what you can upload. The other describes what Instagram will push to people who do not follow you yet.

What each page says

The Reels guide (read 2026-10-05) states that Reels can be "anywhere from 3 seconds to 3 minutes long." The features page (read 2026-10-05) says you can create Reels up to 20 minutes long, and that "Reels over 3 minutes won't be recommended to new audiences." Taken together, 20 minutes is the upload limit and 3 minutes is the recommendation line.

If you publish by API, a limit can differ again, so check the publishing documentation of your tool. This post is only about what the two Instagram pages say.

What a 180-second AI Reel needs on Sume

Sume generates video in jobs, and each catalog row sets its own duration range. In the Video Router table, seedance-2.5 and wan-3.0 accept longer jobs (up to 30 seconds), kling-3, seedance-2 and grok-imagine-video-1.5 stop at 15 seconds, and gemini-omni-flash-1.1 stops at 10 seconds. The number of jobs for 180 seconds is therefore 6, 12 or 18, depending on the row.

At a 720p rate of $0.125 per second (list $0.10 times 1.25, for rows such as Wan 3.0 and Gemini Omni Flash 1.1), 180 seconds is $22.50 either way, because 6 x 30 s x $0.125 equals 18 x 10 s x $0.125. What changes is the number of seams you have to hide, and how many jobs can fail. A 20-minute Reel is 1,200 seconds, which is $150.00 at the same rate and 40 jobs of 30 seconds.

• Pick the longest-per-job row that suits your look, so you have fewer seams.
• Keep a 180-second cap in your brief. A script that reaches 181 seconds should be cut, not published.
• Confirm the live rate in the catalog. These numbers are for the rate in the repository on 2026-10-05.

Using the 3-minute line in a brief

Write the 180-second ceiling into the brief as a hard limit. Give each scene a target length that adds up to it, then render and join the scenes. A Timeline 1.0 render bills per output minute, rounded up, so a cut of 180.0 seconds bills 3 minutes and a cut of 181 seconds bills 4. Trimming one second can save a whole billable minute ($0.10) and keeps the Reel inside the line that Instagram describes.

If the story needs more than 3 minutes, publish it as a series of shorter Reels instead of one long Reel. That keeps each part inside the recommendation line and gives you more chances to be shown.