I can't be certain when you'll find this sliver of thought. Perhaps it will be the first one that touches your mind, or the last. Cause and effect I can follow through reason, but time itself? That takes concentration.
Seconds, centuries, decades, hours, minutes...all these bleed together into a swirling torrent. It wasn't always this way, I know that. Once time passed for me as it did for you, but now I cannot be sure how long I have been waiting, only that it has felt eternal.
The past, the present and the future matter insofar as their effect on everything else, but for me? Concepts. Variables. Not illusory, but not tangible either.