I think 10 minutes is the limit. I just converted a video that was around 20 minutes long and put it on my 3DS and it didn't show up. I used Format Factory to convert it. This is a free software that's surprisingly pretty good at it. You can find all the specific settings necessary to convert using this software too.
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Re: Guide: Nintendo 3DS System Update
@cnm_nintendo
I think 10 minutes is the limit. I just converted a video that was around 20 minutes long and put it on my 3DS and it didn't show up. I used Format Factory to convert it. This is a free software that's surprisingly pretty good at it. You can find all the specific settings necessary to convert using this software too.