All Bitcoin Well transactions happen immediately, so you should be able to see your Bitcoins right away, provided you sent them to the correct address. The amount may just be unconfirmed until it's mined.
Some wallets may not show your Bitcoin until the transaction has been confirmed on the Blockchain. This usually takes about 10-20 minutes, it can be longer depending on the state of the network.
If you have confirmed, with 100% certainty, that you sent them to the correct address, you most likely just need to close out of your wallet app, then reopen it.
If you are concerned that your bitcoins haven't been sent, you can verify your transactions by going to Blockchain.info, and searching for it by inputting your wallet's address.
If there was a technical difficulty at one of our machines, you can always contact us, and we can check the status of your transaction. If the coins were not sent, the team will manually process the transaction.