Length=/=Good
Just look at Trigger. It's not very long at all, even including New Game+ and it's great.
Now, I'm not saying an RPG can't be long, of course that's rediculous. But just saying length is what you want is just as (if not more) rediculous. It has to have a good reason to be long. Just drawing something out to make more gameplay hours is stupid. You flesh out the characters as best you can and make a good story, but you don't go overboard because going overboard can be just as bad as going at it half-assed.