Vernor Vinge's excellent novel A Deepness In The Sky, which is mostly set aboard spacecraft disconnected from planetary time cylces, uses metric measurements of time (namely Ksec and Msec), and part of the fun of reading the book was figuring out what those units meant intuitively when a character mentioned that something would take a couple Ksec to do.
(It helped a bit to remember Adm. Grace Hopper's rule of thumb that "pi seconds is a nanocentury".)
In space disconnected from any plantary cycle is probably the only setup where a metric/decimal time system makes sense because you can set the length of your 'day' to 10 kiloseconds and have it probably work out ok with humans if you change the lights to trick our circadian rhythm.
(It helped a bit to remember Adm. Grace Hopper's rule of thumb that "pi seconds is a nanocentury".)