Definition #1. “An uninterrupted interval of time, of any length”

Under definition #1, a “moment” is defined not by its length but by its uninterrupted nature.

The Definition #1 kind of “moment” can be years, decades, or even centuries long: “At this moment in history, almost two-thirds of the world’s population lives on one continent.”

Once a “Definition #1” moment is interrupted or ended by any means, resumption even of the same activity constitutes a separate period of time — a separate moment — and not a continuation of the first moment.

Definition #2. “A very brief period of time”

For definition #2, P5 of the Trust Test employs one second, the briefest universally familiar time unit that accommodates the multi-exposure behaviors of hundreds of millions of devices.

As per P5, in any situation that there is control over the combining of exposures, all exposures being combined to make the photo must be started within the same single second. Otherwise the photo cannot qualify as TTG.