"Each class story is 25 - 30 hours long."

I don't see how that's even remotely possible. I'm a recently returned player, having played in the beta and at release. I kept hearing that each origin story takes about 25 - 30 hours or so if you just do the purple missions.

I just left Nar Shaddaa and I checked my played time and it says 31 hours. Now, I have been doing the exploration missions and the occasional heroic, but if these planets are all roughly the same length, I'm not even a third of the way through.

Are the later plantets faster to complete, or have the exploration missions really padded out my play time that much?