How long does a day last when Earth is first formed Why and nbsp?

When Earth was first formed about 4.5 billion years ago, a day lasted only about 6 to 8 hours. This shorter day length was due to the rapid rotation of the young Earth, which was a result of the accretion process and the conservation of angular momentum. As the planet cooled and geological processes, such as tidal interactions with the Moon, took place, the length of a day gradually increased over time.