I think you go left from the Motion Detect main screen over to "photo/video. Then the length is set on the Photo/Video options.
If I'm not mistaken, thats the Walmart version of the M-Series camera. The manual is on this page...https://www.moultriefeeders.com/moultire-m-40i-game-camera
It appears the manual isn't written correctly. Don't think the arrow map lines up from one side of the page to the other. Just imagine they are side by side. lol.@Sodbuster may have to help you on this one.
I would give you step by step instructions from these 2 cameras if I could get either of them to turn on. One is a recent purchase, the other about 1 year old, and neither will turn on even with new lithium batteries. These don't seem to be up to what I expected from my M80 and M80 blackflash that I had years of dependable service from
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