100 years
There are 1 trillion years in 1 trillion years!
1 billion years.
1 decade = 10 years
100 years
1 century = 100 years :D
1 decade equals 10 years.
There are a thousand years in one millennium. 1 millennium = 1000 years 1 century = 100 years 1 decade = 10 years
Thirteen years.
20 years
about 1.9 years
1 million years
250 years.