
With the fastest route idea, a passenger jet can cross the world in ~2 days but since they don’t really do that (and because OP included time to drive to the airport I’m assuming it means plausible times with existing routes) lets call it 5 days per round trip so 365 divides evenly. That’s 73 trips to shave a year off. Average US lifespan is 79 years, if you are 21 now that is 58 years left. 58 x 73 = 4,234 trips around the world to end it.