Heinlein's "Starship Troopers" has the space marines using "kiloseconds" and "megaseconds" conversationally, and it was always tricky for me to convert those to hours and minutes in my head accurately.
Rounding up to 4Ks is a reasonable substitute for an hour. Also gives you the convenient 15min ~ 1Ks or "a quarter of a metric hour."
Really? :)
$ units --verbose
Currency exchange rates from FloatRates (USD base) on 2018-10-25
3070 units, 109 prefixes, 109 nonlinear units
You have: 1 megasecond
You want: 1 day
1 megasecond = 11.574074 * 1 day
1 megasecond = (1 / 0.0864) * 1 day