How Long Is a Decade? How Long Is a Century?

The “decade ” word originates from the Greek word dekas which means “a group of ten”. Earlier, Greek people used this word for a group of 10 people. Later on, Russian used this word as a decade to refer to 10 years as a Decade. In this article, you will get all the answers about “how long is a decade” OR “How Long Is a Century

You often heard about the decades in political events and in a history book where they mentioned events 10 years ago or 20 years ago. There are no specific names for the 20s, 30s, or 40 years; they are just known as decades, and they can be written as 2, 3 decades, or 4 decades.

How Long is a Decade?

Well, 10 years = a decade, and more than that known as decades; if the period is 15 years, it will be a decade and a half. There is no specific rule, but people now use the word Decade for 10 years.

How to Identify 20-, 30- or 40-years Span of Time?

Well, it is divisional, but it is not used in a common language. There are scientific terms available below which explain 20-, 30- or 40-years span of time. So check it out

TimeSpan (Years)

In terms of Decade

Latin Name of the period


1 Decade



2 Decades



3 Decades



4 Decades



5 Decades



6 Decades



7 Decades



8 Decades



9 Decades



10 Decades



How Many Years is a Century?

The century is 100 years which is also known as Millennium. You often heard that we live in the 20th century right now, and after 79 years, we will be going to in the 21st century officially.

According to some intellectuals, we are already in the 21st century, and the 20th century was gone with 1900 century. But if we calculate the math, then this is the 20th century.

This century and decade names will help people to compare the previous situation and current situation. It is helpful in every field of this world; people look into history and measure whether they are moving forward or still backward. These words help people to manage the time and correctly calculate them.

How to Measure Decade or Century?

It is very technical mathematically, and here we are going to measure to understand it mathematically. Yes, you can take your calculator and check it out by yourself. Before we move forward to a decade or century, first, we need to know about a day, month, or a single year.

We all know that there are 365 days in a year, 30 days in April, June, September, and November. There are 31 days in January, March, May, July, August, October, and December, 28 Days in February, and after every 4 years, it has a leap year that has 29 days in February.

Let’s get more details

  • 1 minute = 60 seconds
  • 1 hour = 60 minutes
  • 60 minutes x 60 seconds = 3,600 seconds
  • 24 hours in a day
  • 24 hours x 60 minutes = 1440 minutes in a day
  • 1440 x 60 seconds = 86,400 seconds in a day.
  • 28 days for February months
  • 1 day = 1, 440 minutes
  • 1,440 minutes x 60 seconds = 86, 400 seconds in a day
  • 28 days x 1, 440 minutes = 40, 320 minutes in a month
  • 40, 320 minutes for the month of February x 60 seconds = 2, 419, 200 seconds for 28days

We can change a little bit when it comes to the leap year; the number will increase. Now let’s come to the months having 30 days for April, June, September, November.

  • 1 day = 1, 440 minutes
  • 1,440 minutes x 60 seconds = 86, 400 seconds in a day
  • 30 days x 1, 440 minutes =43, 200 minutes in a month
  • April, June, September, November = 120 days
  • 120 days x 1,440 minutes = 172, 800 minutes in 4 months
  • 43, 200 minutes in a month x 4 = 172, 800
  • 172, 800 minutes for 4 months x 60 seconds = 10, 368, 000 seconds for 120 days.

Now check out month of January, March, May, July, August, October, December

  • 1 day = 1, 440 minutes
  • 1,440 minutes x 60 seconds = 86, 400 seconds in a day
  • 31 days x 1,440 minutes = 44, 640 minutes in a month
  • January, March, May, July, August, October, December
  • 217 days x 1, 440 minutes = 312, 480 minutes in 7 months
  • 44,640 minutes in a month x 7 = 312, 480
  • 312, 480 minutes for 7 months x 60 seconds = 18, 748, 800 seconds for 217 days

Now short it to the year so it makes the understandable. In a Year there are 365 days

  • 365 days x 1440 minutes = 525, 600 minutes
  • 525, 600 minutes x 60 seconds = 31, 536, 000

Now imagine extending this math to a decade and a century, and the numbers will be unbelievable.


1. How Long is a Decade?

The time of 10 years is known as Decade.

2. How Many Years in a Decade?

There are a total of 10 years in a decade, in which there are 2 leap years will come. There are a total of 525,600 minutes in a year, and there are 5 256 000 minutes in a decade.

3. A Decade is How Many Years?

A decade is equivalent to 10 years. So don’t worry and enjoy it.

4. How Many Years Are in a Decades?

Time of 10 years is known as a decade, but the time of 20 years, 30 years, 40 years, or more is known as decades.

5. How Many Years is a Century?

When the 100 decades passed then, it is known as the century, also known as the Millennium. So after 100 years, people enter a new century.

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Yashik Patel
Yashik Patel is a Google Certified, Digital Marketing and professional Blogger. He has 5+ years experience in SEO, SEM and ORM (Online Reputation Management) field.

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