According to this core rule book I just bought here, page 320 says XP per session (weekly, in a face to face environment....) can be as low as 10...or as high as 25. And that doesn't count story awards.
At 100+ XP per month, suddenly my 600 XP=Jedi Knight idea doesn't sound so wacky, cause you get there in 6 months of play. My Obi Wan at 2200 XP sounds a lot more reasonable when it takes about 1.75 years to get there.
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...So maybe I'm not so wacky after all to imagine super high XP characters.