If you want to be financial analyst at investment bank then I would agree with the others - let it consume you, and work your butt off till you are 30. I would also add to SAVE YOUR MONEY/INVEST YOUR MONEY during these years and not drink/party/eat it all (as I did)...
This should set you up comfortably for the ensuing years when you may want to settle down and have more work/life/family balance when you need it.
