Dude, you are so screwed!
haha....just kidding. I do wire transfers all the time so maybe I can help.
Was this an international wire transfer or a national one?
If it was national it should not take more than 24 hours and 48 at the most. So the money is probably lost by the bank. Just have him call his bank and trace it. If they lost it then they will find it as it is their responsibility not yours.
If it was an international one it usually takes 2-3 days. Once I saw it take 5 days with no explanation. With international transfers there is often an intermediary bank so that is why it takes longer, I think.
I once did a transfer and my bank manager put the wrong account number as the destination. So when the money did not arrive she just called the receiving bank and moved the money. It was no big deal.