It's not known for sure if time is discrete, though some quantum theories like loop quantum gravity suggests time is discrete/ quantized.
However I suspect you're asking this question based on the block universe perspective, if it is so, then it doesn't predict time is discrete. If time were to be discrete, then within the block universe there can't be a continuous line connecting the past, present and future, that is from a number perspective you would be having times like 1sec, 2sec, 3sec, e.t.c but no time in between like 1.4, 1.5, e.t c ( graph of real numbers). If you get what I'm getting at.
I was suggesting you could add that to the litany of unknowns
Mathematically [guessing here] if time is discrete, then we must be able to count it as it will be analogous to a countable infinity.
Probably in another article, thanks for the notification.
Very true 👍