Let's not waste this moment

Apparently, you don't know that a "moment" can be an "indefinite period of time."

Apparently, you don't know in what context that would be a valid, applicable definition.

You cited context that is perfect valid for that definition. Apparently, you don't understand the meanings of the word "indefinite" and the phrase "period of time."

Generally about 90 seconds. Certainly not 10 minutes.

The reference of the word 'moment' goes back to 1398, found in Oxford English Dictionary. Cornish writer John of Trevisa wrote that there are

The Oxford dictionary is a fine reference; it is not *the* definitive reference. As I stated, the word "moment" *can* mean an "indefinite period of time." It does not mean only what the Oxford dictionary may state.

See Webster's New Universal Unabridged Dictionary, 2003.

Because in other contexts, people have started to use "indefinite" to mean lasting days, months, maybe forever, that does not mean that in this definition it refers to long periods of time. It refers to indefinite SHORT periodds of time.

Only the first meainng below is relevant.

When I called my bank to report my CCard stolen, they said they'd be with me momentarily but it took 30 minutes. Their (recorded) statement was also incorrect.)

So, what exactly is the duration of a "short period?" In this context, "short" and "brief" have nearly the same definition, so please avoid using "brief" to describe "short." Exactly what is the duration of an "indefinitely short period of time?"

The word "momentarily" can mean within an "indefinite period of time." The bank's recorded statement is indeed correct; they responded within an "indefinite period of time."

Moment, shortly, later, etc... There's plenty of words for a period of time, that don't actually tell you anything about how long it is.