Currently Online 
curl-6 on 24 March 2016
I'm okay with this.
Starfox SNES and Starfox 64 could both be finished in a 1-1.5 hour sitting, but you wouldn't see all the alternate stages, as that requires multiple playthroughs.
Miyamoto himself said that SFZ would be "movie length" back in June last year: http://www.gameinformer.com/b/news/archive/2015/06/16/a-star-fox-zero-conversation-with-shigeru-miyamoto-and-his-team.aspx
Starfox was originally built around replayability, so it comes as no surprise that this one will be as well.
