I think the length is not that important if it's skippable.
Though I'm also in favour of shorthening your logo movie, it's quite good, but that "navigate in maze" beginning part looks a bit repetitive, so it can be reduced to just go thru one or two corners quickily and then zooms out to the whole logo.
Moreover, shortening it probably reduce the file size a bit which can otherwise adds some burden to your game's size.
Though I'm also in favour of shorthening your logo movie, it's quite good, but that "navigate in maze" beginning part looks a bit repetitive, so it can be reduced to just go thru one or two corners quickily and then zooms out to the whole logo.
Moreover, shortening it probably reduce the file size a bit which can otherwise adds some burden to your game's size.