microlife
n. A unit of measure equal to approximately 30 minutes of life expectancy.

Example Citations:
Averaged over a lifetime, the following habits are linked to the loss of one microlife: smoking two cigarettes, eating a burger, being roughly 11 pounds overweight, chugging a second or third alcoholic beverage, and watching two hours of television.
—Olivia B. Waxman, "When It Comes to Longevity, It's Not Years But Microlives that May Count," Time, December 17, 2012

Thinking in microlives also makes it evident that unhealthy, life-shortening choices can be balanced by life-extending ones: the first 20 minutes of exercise each day, for example, adds two.
—Oliver Burkeman, "This column will change your life: clearer costs, better decisions," The Guardian, July 6, 2013

Earliest Citation:
I suggest a simple way of communicating the impact of a lifestyle or environmental risk factor, based on the associated daily pro rata effect on expected length of life. A daily loss or gain of 30 minutes can be termed a microlife, because 1 000 000 half hours (57 years) roughly corresponds to a lifetime of adult exposure.
—David Spiegelhalter, "Using speed of ageing and "microlives" to communicate the effects of lifetime habits and environment (PDF)," British Medical Journal, December 17, 2012

Notes:
If you feel like calculating the microlives you lose (or, hopefully, gain) with your daily activities, check out this microlife calculator.

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