How many countries can I visit in 24 hours? We have an unlimited money supply and access to any jet/plane in the world.
Considering: Type of Aircraft, fuel capacity and maximum flying distance, runway size, different time zones, different flying times, flight direction.
For example, if you left Melbourne airport at 5:00 AM, traveled for fourteen hours to Asia, and arrived there at 7:00 AM, local time, we would have only used 2 hours out of 24.
However if we travelled from Melbourne airport (still leaving at 5:00 Am) and traveled to America. If we landed there at 4:00 AM after passing over the date line, we would have gained an hour.
Each stop has to be a minimum of 15 minutes and refuelling takes 30 minutes.