Several definitions of duty:
The action and conduct due to a superior; homage, submission; due respect, reverence; an expression of submission, deference, or respect.
An action due to a feudal superior or lord of a manor.
That which is owing to any one; (one’s) due; a debt; a charge, fee, etc. legally due; a due portion or allowance. of duty: as a debt or thing due.
A payment due and enforced by law or custom.
Action, or an act, that is due in the way of moral or legal obligation; that which one ought or is bound to do; an obligation. (The chief current sense.)
Moral obligation; the binding force of what is morally right. (Sometimes personified.)
The action which one’s position or station directly requires; business, office, function.
Oxford English Dictionary
I think this is a week to reflect upon one’s own duty, and, when finding oneself short—as I often do—to look to role models for inspiration.