Timer resolution for sys$setimr() ?

What is the actual resolution of timer events queued using the
sys$setimr() system service ?

NOTE: this is about when the timer becomes eligible to fire, not when
it actually does, given that VMS is not a hard RTOS.

The base VMS time format is in 100ns units, but I couldn't see anything
about the units actually used when firing timer events. Is it the same
as the hopeless terminal driver timeouts, or is it 100ns, or is it
something in between ?

Thanks,

Simon.

PS: This is purely academic BTW. I am working with some sub-second timers
on a Linux project and was wondering what the situation is with VMS.

Simon.

--
Simon Clubley, clubley@remove_me.eisner.decus.org-Earth.UFP
Walking destinations on a map are further away than they appear.