I often find it easier to think about time in terms of space, in terms of the way we can abstract and spatialize time for a number of broadly mathematical operations. I think that’s pretty common, because we are better suited to conceiving of space than we are to conceiving of time. We can use our better grasp of space to ‘sneak up’ on time.
Once you break down Spinoza’s binary parallelism of modality, you end up with an asymmetrical and indeterminate modality. It is asymmetrical in the sense that what takes place within one mode isn’t simply replicated within another mode. A small change in the mode of extension may have a dramatic or insignificant impact on the mode of thought. It is indeterminate in the sense that we can’t specify exactly how many modes of substance there are.