what's the difference between ‘at such a time’and‘at such times’？

Question

Answer

There isn't really any difference.

One describes 'any' example of it and the other describes 'all' examples of it. So logically they're the same.

It's like saying:

Any breed of dog has four legs.

All breeds of dog have four legs.

Answer

“At such a time” can refer to a specific moment in time and the specific conditions that created it. “At such times” is more general and describes a more generalized understanding of how  conditions can lead to such moments

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