UK—‘a legend in your lifetime’ (1913): allegedly said by Benjamin Jowett to Florence Nightingale—‘a legend in his own lunchtime’ (1969): first recorded in a theatrical review by John Cunningham
UK, 1820—to show willingness to enter into a contest or take up a challenge, especially in business or politics—originally (1804) used in boxing with reference to the custom of throwing a hat into the ring to signal willingness to enter a contest
The adjective ‘living’ is an intensifier, and ‘daylights’ is an 18th-century slang term for ‘eyes’ chiefly used in contexts of physical violence or threats.