The horse trail bisects the Ice Age Trail to the northeast (straight and slight right for 50Kers). Look for a yellow marker (painted rectangle on trees or rocks). This is the identifying marker for the Ice Age Trail along the entire course. There will be sentries there to help guide you through this intersection.
The total flight duration from Sydney, Australia to Rome, Italy is 20 hours, 47 minutes. This assumes an average flight speed for a commercial airliner of 500 mph, which is equivalent to 805 km/h or 434 knots. It also adds an extra 30 minutes for take-off and landing.
Dallas Fort Worth to Sydney is around 17 hours, and there are some direct flights on that route. However, most routes go via LAX, so you are flying across the US before you actually start for Australia. LAX to Sydney is around 15 hours, NYC to LAX is around 5 hours. By the time you have dealt with layovers and the security circus, NYC to Sydney will be about 22 - 24 hours.