Depends on how many are leap years.
138 seconds.
138 / 12 = 11.5 years.
2 minutes and 18 seconds or 2.3 minutes.
The answer depends on 138 WHAT! Seconds, days, years? And since you have not bothered to share that crucial bit of information, I cannot provide a more useful answer.
That's 138/9 hours.
11 years and 6 months.
There are 1263141040 seconds in 40 years
10 years = 315,569,260 seconds.
18 years is about 568,036,800 seconds.
About 1,009,843,200 seconds in 32 years.
20 years = 631,138,519 seconds.
25 years = 788,923,149 seconds.