12hrs of mining at 60% should get you about 4,000 IOTA on a fairly recent i5. It's not worth much but gives you a few thousands of IOTA to play with and show to your friends. You will become intrigued by the 'no fees' concept, trust me.
If this is true you'd be a millionaire within 83 days.
Edit: Oh you mean 4 IOTA, not 4000. So it will take 83000 days, my bad..
