Seconds make up minutes which make up hours which make up days which make up weeks which make up months which make up years. That's like asking how many meters make up an inch- it doesn't work, because a second is smaller.
One year is equal to 24 x 60 x 60 x 365 = 31536000 seconds. Therefore, 18 years is equal to 31536000 x 18 = 567648000 seconds.
There are 1,000 milliseconds in one second.
There are 1,000 milliseconds in one second.
1 second = 0.000277777 hours
1000
The answer is 10'800.
12 years
1000 milliseconds = 1 second
20 years
31.7 years
6 years
seven