time isn't a terrain across which we can travel or send messages.. thinking of it that way is sort of the same mistake as imagining X-wing fighters zooming through asteroid fields and engaging in dogfights.. in the latter case, we are imagining what it would be like if the physics of aerial flight applied to the realm above it - space..

with time travel or hyper-temporal communication or something, we are imagining that what we call time is a static terrain that has something like "addresses" where events reside permanently.. we are trying to apply the rules of the 3 dimensional realm (travel to and from addresses) to the one above it, and they don't fit..

there is only one temporal "address" associated with this reality, and we already occupy it.. time is essentially too busy continuously creating this reality to remember or know about others..