I think I've asked about this in the past too, but I've forgotten the answer.

How does one tell the time, by the use of {Qoylu'pu'} when the time isn't a "round" number ?

How do we say by the {Qoylu'pu'}, that it's 21.45 ?

I don't think we know. If you take the expression literally, the answer would be to say cha'maH wa'logh Qoylu'pu' it has been heard twenty-one times. Because at 21:45 whatever it is has been heard twenty-one times. The idiom does not seem to describe fractions of an hour.

Given that the Qoylu'pu' idiom is supposed to be the most common way to tell the time outside of a military or interplanetary context, even though a non-military context is said to be rare, it seems odd to me that there would be no way to be more specific. Who knows? Maybe they say something like loSmaH vagh tup ret cha'maH wa'logh Qoylu'pu' forty-five minutes ago it had been heard twenty-one times.

-- 
SuStel
http://trimboli.name