There is a little something about “time-nuttery”:
The shortest imaginable time step is around 10E(-44) second as we know it.
It is the time light needs to travel the Planck distance.
Historically the improvement on measuring time has improved one decade every ten (10) years. Currently NIST/BIPM are around 10E(-16) so, following the improvement rate per 10 years it will take roughly another 300 years to close this gap.
Or there is something about physics we do not yet quite understand and that seems very probable.
So, synchronizing my equipment with a fixed and well maintained time reference is all I can do and will have to be satisfied with, ignoring phase noise, jitter and whatever else one can worry about.
Unless of course, you thoroughly enjoy this state of mind.
To date this time step has not been named, in engineering units the counting stops with yocto”, which covers 10E(-24). The system does not yet go any further down.
My intention is to keep it practical since, in all honesty, I will not be the one to close the physics gap.