Over roughly 3.5 trillion years of human life have been lived (to see below for math) but the punch line is all of that and when you calculate how many years insects and animals and angels were talking about numbers that are maybe in the Googles, but all of that is so you and I can fall in love with G-d and one anotherShort answer: roughly 3.5 trillion person-years of human life have been lived so far.How I got that (back-of-the-envelope, but sturdy):People ever born: ~117 billionAlive today: ~8.1 billion → already lived on average ~31 years eachPeople who have died: ~109 billion → average lifespan across history ≈ ~30 years (high infant/child mortality keeps historical averages low)So the cumulative time lived ≈(109B × 30 years) + (8.1B × 31 years) ≈ 3.5 × 10¹² person-years= about 3.1 × 10¹⁶ person-hours or 1.1 × 10²⁰ person-seconds.Reasonable uncertainty range (depending on the exact “ever born” count and historical lifespans): about 2.8 – 4.4 trillion person-years.