Time Spent Calculator

This breaks a life into its major activities, sleep and work and commuting and eating and screens, and expresses each as hours, days and years. The point is perspective rather than precision. Time is the one resource nobody gets more of.

Core formula: Lifetime Hours = Daily Hours × 365.25 × Years

Percentage of waking life: % of Waking Life = (Daily Hours ÷ (24 − Sleep Hours)) × 100

Percentage of total life: % of Total Life = Daily Hours ÷ 24 × 100

What each variable means:

• Daily Hours: what you actually do, not what you intend to do. Aspirational figures produce a comforting answer and a useless one.
• Years: how much of a life the activity spans. Work runs 22 to 65, so 43 years. Sleep runs the whole way.
• Waking hours: total hours less sleep, which is the honest denominator for everything else.

Reference: US average lifetime time allocation (Based on 79-year lifespan, 8 hours sleep/night)

• Sleeping: 26 years (33% of life)
• Working: 10.5 years (ages 22–65, 40 hrs/week)
• Screen time (TV + phone): 11–14 years (growing each decade)
• Eating and drinking: 3.5 years
• Commuting: 1.5 years (US average 27 min/day each way)
• Exercising: 1.5 years (if 30 min/day consistently)
• Personal care/hygiene: 2.5 years
• Leisure and social: 4–6 years

Worked example: You spend 3 hours/day on social media and streaming. You are 25 and expect to live to 80.

Remaining years: 55 Hours: 3 × 365.25 × 55 = 60,266 hours Days: 60,266 ÷ 24 = 2,511 days = 6.88 years

Of your remaining waking life (55 years × 16 waking hours × 365.25 = 321,420 waking hours): % spent on screens = 60,266 ÷ 321,420 = 18.75% of all remaining waking hours

Reducing to 1 hour/day reclaims: 2 hours × 365.25 × 55 = 40,178 hours = 4.59 years of life back.