It's difficult to trust that bit of info. Star Ocean games have never been that short. It most likely has 40 to 100 hours of gameplay if you do most of everything.
The Original Star Ocean can be beaten in about 20 hours. Now that I do give it a second thought - As long as it has the typical post game content and that true blue SO grind.... I dont care. The idea about there needing to a certain length designation is just as bad as pixel designation.