Full record for light-week n.

Definition the distance light travels in one week
OED requirements antedating 1934
Earliest cite E.E. Smith, 'Skylark of Valeron'
Comment Mike Christie submitted a 1944 cite from Wesley Long's "Nomad".
Michael Dolbear submitted a cite from a 1997 reprint of David Weber's 1996 "Honor Among Enemies".
Mike Christie submitted a cite from a 1980 reprint of Larry Niven's 1973 "Protector"; note that the 1967 original magazine version does not contain this cite.
Malcolm Farmer submitted and Mike Christie verified, a 1960 cite from Poul Anderson's "The Burning Bridge".
Fred Galvin submitted a cite from a 1974 reprint of A.E. van Vogt's "The Storm", which Mike Christie verified from the original 1943 publication.
Fred Galvin submitted a cite from a 1982 reprint of Jack Vance's 1952 "Sabotage on Sulphur Planet", which Mike Christie verified in the original
Douglas Winston submitted a cite from a 1966 reprint of E.E. Smith's 1949 "Skylark of Valeron", which Mike Christie verified in its 1934 first publication.

THe OED entry lists a 1992 cite

Last modified 26 July, 2009

Citations for light-week n.

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1934 E. E. Smith Skylark of Valeron in Astounding Stories Aug. 24/1 They have warning long before anything can possibly happen. They can, and do, spot trouble over a light-week away, so their plans allow one week to perfect their defenses.
1943 A. E. van Vogt Storm in Astounding Sci.-Fiction Oct. 19/1 By making a point 0100 turn we shall miss the storm by seven light weeks. I admit it is an appallingly sharp curve, but I feel that we should have at least that much leeway.
1944 ‘W. Long’ Nomad in Astounding Sci. Fiction Dec. 21/2 We are close to Sol. A light-week or less.
1952 J. Vance Sabotage on Sulfur Planet in Startling Stories June 104/1 How far had they come? Little more than a light-week or two; he could hear the whir of motors still building up acceleration.
1960 P. Anderson Burning Bridge in Astounding Sci. Fiction Jan. 100/1 Nevertheless that pencil must scrawl broadly over the sky, and for a long time, merely hoping to write on its target. For when distances are measured in light-weeks, the smallest errors grow monstrous.
1973 L. Niven Protector (1980) 179 We're only a couple of light-weeks out from Sol, and he's a light-year away, and I think he's decelerating.
1996 D. Weber Honor Among Enemies (1997) 334 I figure we'll clear the planetary hyper limit, pop into h-space and move a couple of light-weeks out, then come back in the same way we did for Sharon's Star.