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Well, I guess I'll actually be one of the HONEST ones on this board and say each game probably took me a few days to a week to finish.
As for the actual hours? I don't know, but I'd probably estimate that each chapter probably took roughly half-an-hour to complete. And with eight chapters, that would probably mean:
Story: 4-6 hours (I replayed a few levels to acquire data disks) Bonus: 2-3 hours (again, I replayed a few levels to acquire data disks) Arena: 5 hours? (this is a total guess, but there were a TON of these ... and I replayed many of them to acquire data disks)
Now, I WILL admit that, after beating the Autobots game, I probably played through the Decepticons game much faster because the Arena missions were identical and some of the levels were extremely similar.