I've heard it can save up to 17 minute replays now. So not much to worry about on that front.Question:
How does the replay channel work? I been here conflictions about what can be recorded and for how long.
Any idea and can I take the video elsewhere?
If it's at all like Brawl (and it probably is, because file size), then replays are just the inputs and variables associated with the match, rather than any kind of actual video file. So you can't really do anything with it, unless you can record 3DS footage. Unless there's a new feature I don't know about. I should let people with the game answer, lol.