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Hello Hon Jia,
Thanks for your comments. I cannot tell you I have all the answers but I do not see any other road that can lead us to truth and reality. The further details will be filled in by dialectic and reductio ad absurdum type arguments.
For example, nothing, not even a monad can exist in nowhere. A monad is a something and a somewhere. Nowhere means no place. If you check the Newton and Leibniz quotes, 'somewhere' and 'something' are essentially comprised of the same "atoms of nature". So, the question of how long it has been in nowhere should not arise. I think the appropriate phrase is arising ex-nihilo.
Only things that exist can have a lifetime and if existent things have a variable lifetime, by default duration and time must arise.
The appearance of a monad and its annihilation according to Leibniz will occur in an INSTANT. The current theoretical thinking of this shortest duration is the Planck time.
Non-monad do not exist so it cant have a perspective and cannot have a need to identify any event.
Monad is the fundamental unit of geometry so space is a composite of monads, just like you and me. Leibniz tells us that, "...monads are the true atoms of Nature--the elements out of which everything is made". And Newton concurs, "...And my account throws a satisfactory light on the difference between ... a body and a region of space. The raw materials of each are the same in their properties and nature,..." (see my reference). As you rightly point out, monad cannot leave traces. It has no parts, unlike composite things. It appears and disappears all at once.
Time remains a difficult concept for me to grasp. But time can ONLY be contemplated within and by what exists. And ALL that exist, both body and space is a composite of monads. Again, monads are not eternally existing things and are not all created or annihilated together. Somewhere in this, the perception of time must come in.
More homework needs to be done on 'Time'. Many thanks for your comments.
Regards,
Akinbo