Borexino neutrino experiment
Physicists could have to wait 66,000 yottayears to see an electron decay
The longest coherently described span of time I’ve encountered is from Hindu cosmology. It concerns the age of Brahma, one of Hinduism’s principal deities, who is described as being 51 years old (with 49 more to go). But these are no simple years. Each day in Brahma’s