It is like this:
1. When reach 100 dollars or more on January 31, 2009.
2. In February, the earnings for January will show up in between 1 to 10th date of Feb.
3. Adsense will check for any holds up until February 15th and if there is no hold, a payment-processing link will appear in your account after February 15th and then between Feb 20 to Feb 28, the payment sent to your address details will be displayed.
4. In March, if you have opted for express delivery check, the payment will reach you by 5th and if you have opted for standard delivery, it will reach your address in between March 25 and 30.
So dear, you will receive you payments for the money earned up until Jan 31st in between March 25 or 30.