1. Yes, but he'll sustain his work rate for years while you'll burn out in one, therefore achieving less in the long run. 2. Yes, but do it for your own ambiti

1. Yes, but he'll sustain his work rate for years while you'll burn out in one, therefore achieving less in the long run. 2. Yes, but do it for your own ambitions and projects, NEVER for a corporation -- they'll squeeze every bit of productivity out of you and then replace you once you turn in to a burnt out husk. 3. Yes, but set yourself a goal and slow down once you reach it. Then enjoy the wealth you've earned. Source: Personal experience. I violated all of the above and suffered the consequences before becoming enlightened. Edit: typo