[atlas] How long is a year?

On my probe’s status page, there is an “All Time” “Time Connected” of 8y 343d 15h 30m. How many minutes are in a “y”? Context: in trying to illustrate uptime (number of 9’s) I wanted to show how long it would take to achieve different number of 9’s based on my probe’s history. (It’s only at one ‘9’ - 97%.)