Which is harder, the ontological resolution of dimensionality (extensionality, space) or the resolution of time?
In posing this question, I would firstly reject that time is a dimension, and also reject that dimensionality is simply "independent measures".
The fact that time can be measured by numbers does not tell that time is a dimension at all, for indeed anything at all can be marked with ordinals (should we then say that it is thus a dimension?). Thus there is no such thing as "n dimensional" time, there is only "one sense" of time, and that is - intuitively put - "there being more".
While dimensionality (extensionality) itself is not also reducible to numbers - degrees of freedom is not extensionality. Nor should plain cardinality, ordinality or relationality explain extensionality at all - relations are not "extended".
It seems like both space and time are irreducible, but this is only what seems so, for it would be quite arbitrary that the world "just is" this dual. And also, the immanent issue is that it seems like time cannot explain extensionality or vice versa.
The question is thus are they irreducible and if not then are they reducible to monism or pluralism?