Well it depends how much fees you have paid for transaction.If you have paid 0BTC then it is normal to be zero confirmation even after 24 hours.It may also get no confirmation even after 24 hours provided if the fees is too low for the transaction amount.

I think you are new to bitcoin.So read this: https://blog.blockchain.com/2014/10/29/quick-bit-understanding-bitcoin-transaction-fees/