For me the first time through was close to 50 hours. The second time about 40 hours and the third time was about 38 hours … and all three times I was thinking: "I can't wait to meet the Batarian slavers so I can kick their 4 eyed, ugly nosed butts"
Let's wait and see what's what when it comes out before we pass judgment (I was skeptical about Mass Effect before release but was proven wrong on every point, so while I can't help but make mistakes, I try not to make the same mistakes twice).