Yeesh, I figured out the "disbelieve time" reference. I bit heady but definitely not a nuanced rejoinder.
In D&D (IIRC) if you face an illusionist who is creating illusions, the action required to overcome the illusions is to "disbelieve" in the illusion. Grab the ol' d20 roll vs save (of some sort. I Haven't actually played D&D since 1982). and if you succeed, presto the illusion disappears.
The gag, as I recall, involves the party facing an illusionist and in the last room, they encounter a fierce dragon. The players realizing that the dragon is way over powered for their group, one of the geniuses decides to "disbelieve" the dragon. He succeeds the save roll, but the dragon wasn't an illusion after all. TPK.
AND, is some circles among physicists there is the thought that "TIME" is an 'illusion.'
Ergo, "I disbelieve your assertion regarding the time it takes for a turn to complete."
Yeah, I know. Still absurd.