How long does it take earth to do one complete rotation?

Answer 1

It takes 24 hours to complete one rotation relative to the Sun, but for the last 4 minutes the Earth is rotating a little more because it has also revolved a little in its orbit round the Sun. So it spends 4 minutes catching up. The answer is 23 hour 56 minutes.

Answer 2

Assuming you mean one rotation on its axis, it takes approximately 24 hours. If by some chance you mean a rotation around the sun (called an orbit) that takes approximately 365 days.

Answer 3

24 hours