Pick a day between Sunday, Monday, Wednesday, Thursday, Friday, and Saturday, and you can say that one seventh of your life was that day.
But how much of your life was a Tuesday?
For those who don't get it and want the joke spoiled for themselves:
[spoiler]https://www.bungie.net/en/Forum/Post/218401575/0/0/1[/spoiler]
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I was born on a Wednesday. If I die any day after Wednesday but before the next Tuesday your formula is slightly off