This is a simile which makes the reader think about how long it's taking for the hours to go by.
There are 87,600 hours in 10 years (365 days/year * 24 hours/day * 10 years).
there are 192,720 hours in 22 years, not counting leap years. counting leap years there are 192,840 hours.
Wise beyond his years
Disregarding the leap years, 17598840 hours Regarding leap years, about 17610888 hours
there are 613200 hours in 70 years. there are 8760 hours in one year. Except for leap years, which comprise 8,784 hours.
There are 61 years x 365 days = 22,365 days in 61 years. As there are 24 hours in a day, there are 22,365 days x 24 hours = 536,760 hours in 61 years.
10 years = 87,658.1277 hours
Four years = 35,063.2511 hours.
1.3 years is 11,405 hours.
32 years = 280,506.009 hours.
34.5 years = 302,420.541 hours
2,000 hours = 0.228159105 years.