The Street Fighter 5 cinematic campaign, due for release in June, will take you around two hours to finish.
The version of Street Fighter 5 that comes out this week, does not include a single-player, cinematic story. That much is know, and Capcom is currently planning to release it as a free update in June.
It seems this mode will not take you long to play either, according to Street Fighter producer Yoshinori Ono. Ono along with Tomoaki Ayano, talked about this as well as other challenge mode tidbits in the video below.