Once you have reached the $50 or beyond earnings mark you will have to wait a month or longer before it is deposited into your PayPal account.
Example: If you have earned $53.22 by the end of April 2014 (just a hypothetical amount), your earnings in that amount will be deposited into your PayPal account on or near May 28, 2014.
Say you earn another 49.99 during the month of May -- you will have to wait until your earnings are a full $50 before you will receive a payout. If you earn another 52.00 in June that will be added to the 49.99 earned in May. The two will be added together and you will receive payment for both on or near July 28.
There is an approximate 30-day waiting period at the end of each month before earnings for that month are paid out, and even then they will not be paid out until the total is at least $50 or more.