In this reality, Charles Xavier became the Juggernaut who formed the X-Men. Thunderbird is a member of Charles Xavier's X-Men who serves as a police force that aids the mutants and persecutes the sapiens.
The total flight duration from Sydney, Australia to Boston, MA is 20 hours, 41 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. Your exact time may vary depending on wind speeds.
This means that you can take up to 1 year travelling out through Asia and working in Australia and then spend another year travelling back through NZ, the Pacific Islands, the USA and Canada. Ticket 1 will be a one-way flight to Australia valid for 1 year.