Rather rude if you to bring facts into the discussion, really.Sacroscanct seems to have just blocked me despite replying to my last post, but anyway the same timekeeping advice is found in Book 3 of OD&D (Undeworld and Wilderness Adventures): p 38 says that "1 week of actual time = 1 week of game time". At least as far as Conan is concerned, this emphasis on precision in time-keeping is quite different from the "time passes" approach REH takes to the narration of Conan's life; but it is fairly integral to the non-pulpy resource-management aspect of classic D&D play.
As a sidepoint, Sacorsanct also asserts that a thief's hide in shadows protects against infravision, whereas the AD&D rules actually make the opposite clear - infravision detects a hiding thief unless there is a nearby heat source (PHB p 28); whereas a Cloak of Elvenkind gives a 90% chance of invisibility against infravision regardless of whether or not a heat source is present.
The idea that hide in shadows makes a name-level thief "near-invisible" is simply not borne out by the actual AD&D rules. (I don't have the Greyhawk supplement, and so can't comment on whether thieves were stronger in that book than in AD&D.)