The problem is the length of pipe between the water heater and this fixture is so great it take that long to flush the cold water from pipe. If this is a 3/4" pipe and the distance is fairly long, it will take considerable time. One way to remedy this is to install a recirculating system. There are 2 or 3 variations of these for different situtations. Laing is one company that makes the pumps. A Google will get you their website and give you a place to begin. If you can install a recirculating system, you will have instant hot water to every fixture on that hot water line.