Dochmey law' jatlhpu' wo'rIv. This information was provided in CK in the context of Klingon punctuality and telling hourly time. There, it makes sense in the context that if a Klingon tells you they'll meet you at 1500 hours, they will meet you at 1500 hours, not 1455 or 1505. It makes less sense to generalize it to all Klingon behavior all the time. Thanks to
this collection of Star Trek shooting scripts, I
know it doesn't apply to Klingon behavior all the time:
TNG: "Timescape"
RIKER: How long until our rendezvous with Captain Picard?
WORF: Approximately thirteen hours.
TNG: "Birthright, Part 1"
WORF: The foliage is very dense. It will take me approximately twelve hours to reach the camp. I will have to travel during the night.
TNG: "Homeward"
WORF: I am picking up faint life signs approximately two-hundred meters from my position. I am heading toward them.
TNG: "Firstborn"
RIKER: How long would it take us to reach the Kalla system?
WORF: Approximately sixteen hours.
TNG: "A Matter of Time"
RIKER: Dimensions, Worf?
WORF: Approximately five meters in length, sir.
TNG: "Rightful Heir"
GOWRON: What kind of fools do you have working for you, Picard? The imposter's been aboard for nearly a day.
DS9: "Children of Time"
WORF: There are several settlements scattered across the southern peninsula. I'm reading approximately eight thousand inhabitants... they appear to be human.
DS9: "Call to Arms"
WORF: Weapons ready. The Dominion fleet will be in range in approximately five minutes.
DS9: "Once More Unto The Breach"
MARTOK: I've hated his name for almost thirty years. I've dreamt of the moment when I'd finally see him stripped of his rank and title...