I'm not sure if there's anything you can do other than increasing the miner's fee, but this is one of the major drawbacks of using bitcoin.  Four hours is just ridiculous if we ever expect btc to gain function as a currency.  On a related note, I bought some physical silver recently, and it was such a fucking hassle that it would have been much easier to just pay for it with cash.  It wasn't just the transaction time in this case, it was the Mycelium wallet.  When stuff like that happens, it really makes me doubt the utility of bitcoin.