**How long is a century in seconds?**

This answer to this will depend on which century you are looking at, depending on how many leap years there are in that century.

Three out of every four Centuries have 36,524 days each, while the other Century has an extra leap year so has 36,525 days.

Therefore, based on 36,524 days, there are 3,155,673,600 seconds

Based on 36,525 days there are 3,155,760,000 seconds.

**How long is 50 years called?**

There are a number of terms you can use including semi century, half a century or semi centennial.

**What is a 1000 years called?**

A time span of 1,000 years is called a millennia or a millennium.

**What’s bigger than millennia?**

Beyond millennia, terms you can use include a **Galactic Year, or sometimes called a cosmic year. **

A galactic year is in the region of 230 million years.

It is also known as a Cosmic year, as this is the number of years required for the solar system to orbit around the center of the Milky Way galaxy.