It depends what calculation you are doing.
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The time it would take to type out one billion numbers would be better spent on more pressing concerns. I suspect you don't really need the information, but just want to see if someone will do it. The answer is no.
You would write it as "2 hours"
Divide by 60. In this case it would be: 3.45 hours, about three and a half hours.
About 100 billon
There are 60 minutes in an hour. To calculate the number of hours in 715 minutes, you would need to divide this number by 60: 715 / 60 = 11.916666666666666666.... Which is close to 12 hours. But if you wanted to be more exact, you can take the numbers after the decimal point (0.916666666666666666...) and multiply it by 60 to get the number of minutes. In this case, the answer would be: 11 hours, 55 minutes.