Question 1189565
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1 pack = 20 cigarettes
2 packs = 40 cigarettes


The person smokes 40 cigarettes a day


Since 1 year = 365 days, give or take, this means they smoke 40*365 = 14,600 cigarettes a year. 
This assumes that the rate of 2 packs per day is kept the same.


Over the course of 35 years, they smoke a grand total of 35*14,600 = 511,000 cigarettes
That's a little over half a million cigarettes.


Next, we assume the worst that one cigarette takes 15 minutes of max lifespan away. 
That would mean 511,000 cigarettes take 15*511,000 = 7,665,000 minutes away.
The number 7,665,000 is roughly 7.67 million.


This is the total hypothetical time taken away. Keep in mind that all of this is very very loosely based on a lot of assumptions. In reality, there is no actual way to perfectly calculate the exact amount of lifespan lost. There are many other factors we haven't considered (eg: the persons diet and exercise routine).


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The next task is to convert that massive number into years, days, hours, minutes format.
 

We'll need this chart
1 hour = 60 minutes
1 day = 24 hours
1 year = 365 days


Let's find out how many minutes there are in a day
1 day = 24 hours = 24*60 = 1440 minutes


Do the same for one year
1 year = 365 days = 365*1440 = 525,600 minutes


So the more relevant chart is
1 hour = 60 minutes
1 day = 1440 minutes
1 year = 525,600 minutes



To convert from purely minutes to purely years, we divide by 525600
7,665,000 minutes = (7,665,000)/(525,600) = 14.5833333333333 years
which is approximate. 


We drop the decimal portion and just focus on the 14 up front.
This means "<font color=red>14 years</font>" is part of the final answer.


Multiply that decimal portion with 525600 so we figure out how much is left over so to speak
525600*0.5833333333333 = 306,599.999999982
That rounds to 306,600


Next, we divide that result by 1440
(306,600)/1440 = 212.916666666667
We ignore the decimal portion and see that it's roughly <font color=red>212 days</font> which is also part of the answer.


Then note that,
0.916666666667*1440 = 1,320.00000000048
which is basically 1,320 and the decimal portion at the very end is rounding error (the 48 shouldn't be there).


Lastly,
1320/60 = 22
Meaning 1320 minutes is exactly <font color=red>22 hours</font>. There are 0 extra minutes.



Overall,
7,665,000 minutes = <font color=red>14 years, 212 days, 22 hours, 0 minutes</font>


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Check:


We can use this formula
A = 525600B+1440C+60D+E
where
A = total time value in minutes only
B = number of years = 14
C = number of days = 212
D = number of hours = 22
E = number of minutes = 0


The 525600 refers to the number of minutes in a year (roughly)
The 1440 is the number of minutes in a day since 60*24 = 1440
The 60 refers to the number of minutes in an hour


So,
A = 525600B+1440C+60D+E
A = 525600*14+1440*212+60*22+0
A = 7,665,000
which matches from earlier. The answer is confirmed.


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Final Answer:
<font color=red>14 years, 212 days, 22 hours, 0 minutes</font>
This value is approximate.
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