I really like western RPGs, but given the small time I have to put into gaming, I usually spend about 2 months of exclusive playing to finish them.
Dragon Age Origins - put in roughly 65 hrs into it, counting the expansion and DLCs (and no playing different classes or races or anything)
Dragon Age 2 - Around 35-40 hrs, but it was a lesser game than DA Origins anyway
Fallout NV - damn, that took forever. I don't really remember how long, but it must've been close to 50 hrs, and I skipped on the DLCs this time around. With Fallout 3, it took even longer.

And those are just the last 3 RPGs I played...

I fear for my social life in the next few months, when Skyrim and Mass Effect 3 roll out.
Not counting the huge backlog I still have of FPSs, Action, Racing, etc...

All work and no play makes me..., well, you know the rest.