This site tracks the average confirmation time. Do you know the policy for localbitcoins.com for posting your ballance? Sometimes services require at least 3 confirmations before it will show your ballance. This can take some time...
The longest I had to wait was about an hour and a half I believe.
EDIT
This is some helpful info from their FAQ page:
https://localbitcoins.com/faq#how_long_wallet if you are still having issues.
I made a transfer from localbitcoins.com and it is not showing on the receiving end!Check the address you sent on blockchain.info. It will show you the status of the transfer. Usually one confirmation takes about ten minutes, but it varies. If everything looks all right, you should contact the receiving service. Note that different services require different amount of confirmations.
If the transfer doesn't show on blockchain.info or blockexplorer.com when searching with address after 30 minutes, please send contact
support@localbitcoins.com and state when you sent, to what address and what amount, and we will inspect the case.