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> Over a long enough time the efficacy drops to zero.

And in the long run, we're all dead.

Yes, so why are we stressing about this? Just focus on getting healthy and doing the best we can is our long term limit of capability.

Masks won't save us.

So, no need to use, buy, sell, or produce sun screen. It just increases the time you can stay outside without getting a sunburn from a few minutes to hours. Totally useless. /s

All you need is a moment of infection. A single second, one breath of air through a leak in your mask. Sunburn is not even remotely similar.

This just isn't true. Viral load matters.

How long?

Good question, doesn't it depend on environment? If you are alone in the woods, the mask will always work forever.

If you are in a small room with a dozen infected people coughing...?