How long does it take to receive bitcoins?
You should check the following:


Are you sure you entered the right address to receive the Bitcoins?


If the address is not correct, the coins are lost

Did your Bitcoin client download all the blocks in the chain? (>150000)


If not, you need to let it run for awhile, until it downloads all the blocks, making sure that you have a couple connections and the block number is slowly increasing in your client application