If you want a fast trade then better to choose the buying/selling price in the next 5 on the list, and with this you can easily filled your trade without waiting any longer. Your trade will always depend on the price, and the buyer and seller level, so make sure to check it before you place a trade.
If he does not want to set a particular price that bitcoin price will get to before is order would be filled, then why not used market order for fast trade? With market orders the order is filled immediately. Market order should only be used on non shady exchange and also with coins if high trading volume.