The short answer
Here is the clear answer.
Santa prepares all year, follows a carefully planned route, and uses North Pole magic to make Christmas Eve last exactly as long as he needs.
The mission starts long before Christmas Eve.
The North Pole does not wait until December. Elves organize the workshop, Santa studies his route, and the reindeer practice flying together through snow, wind, and starlight. By Christmas Eve, every part of the mission has been checked more than once.
Santa's sleigh is built for the job. It carries far more than an ordinary sleigh, stays steady in the winter sky, and always knows which home comes next.
North Pole time is not ordinary clock time.
A minute on a kitchen clock is always a minute. A Christmas Eve minute can stretch, sparkle, and make room for one more rooftop. That is why Santa can cross oceans, visit cities and country roads, and still arrive before morning.
Time zones help too. Night reaches different places at different moments, so Santa follows the darkness around the world while families sleep.
The reindeer and Santa work as one team.
The reindeer read the wind and stars while Santa guides the sleigh. Each landing is quick, quiet, and practiced. When the last gift is delivered, the whole team turns north for cocoa, carrots, and a well-earned rest.
Quick North Pole answers
A few more things curious hearts ask
Can Santa really visit the whole world?
Yes. His all-year plan, worldwide route, flying team, and Christmas Eve magic make the journey possible.
Does Santa travel through time zones?
Yes. Santa follows nighttime around the globe, giving the Christmas Eve mission even more room.
What happens after the last delivery?
Santa and the reindeer return to the North Pole to rest and begin planning for next Christmas.