"A Planck time unit is the time required for light to travel a distance of 1 Planck length in a vacuum" https://en.wikipedia.org/wiki/Planck_units#Planck_time_

"A Planck time unit is the time required for light to travel a distance of 1 Planck length in a vacuum" https://en.wikipedia.org/wiki/Planck_units#Planck_time_and_length https://en.wikipedia.org/wiki/Planck_units#Planck_time_and_l...