Even more delay has happened with me couple of times in recieving even 1 confirmation for my bitcoin transaction.I think upto 12-16 hours i have waited once getting 1 confirmation but you doesnt need to worry about it,it only happens sometimes and should get confirmed at some time.
Few months ago happens that someone send transfer without fee and transaction was waiting 3 days in queue.. after three days come back to the wallet.
Standard fee is 10k satoshi. If someone want be sure that transaction will be realised faster is better to pay more than 10k satoshi fee..