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People seconds
Scale of some things
 People seconds
 Rough Draft

 ... 100 you spending 1 second 101 102 a 30 s comment in a 30 person class 103 104 105 a 30 person 1hr class | a person work week 106 awakeness in a month 107 a person work year 108 109 a life | 10k person work weeks 1010 1M people watching a 1hr program 1011 a city work day 1012 1k lives 1013 a US people day 1014 1015 1M lives (a mega life) | a World people day 1016 1017 1018 1G lives (a giga life) 1019 1020 ~total Homo Sapien seconds 1021 1T lives (a tera life)

## Landmarks

 world people seconds per day - 0.5 × 1015 (±5%?) half a mega life

 human life expectancy - two gigaseconds (Gs) (2 × 109s, [...do error bars...])

## The back of my envelope...

Life expectancy
~70 yrs ~= 2 × 109 s.
(50,80) yrs ~= (1.6,2.5) × 109 s

A class
30 people for 1 hour = 1 × 105 people-seconds.

Creating a person
0-4mo: 1.1 × 107 s x [1, 2]
4-9mo: 1.3 × 107 s x [1, 2]
0-2yrs: 6,3 × 107 s x [1, 2]
2-5yrs: 9.5 × 107 s x [1, 2]
5-20yrs: 4.7 × 108 s x [1, 2]
So just 20yrs ~= 109. Eh.
Would be more interesting to do with `productive time', ie sans sleep/eat/maintenance.

7 hour day
7 x 60 x 60 ~= 2.5 × 104 s

people seconds / day
5.7 × 109 x 8.6 × 104 = 4.9 × 1014
Say 0.5 × 1015 people-seconds/day (±<5%?).

 A View from the Back of the Envelope Comments encouraged. - Mitchell N Charity