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What would be the minimum amount of time needed to maintain a language? And what would be the maximum number of them that you could manage?

In terms of maintenance, I’m talking about Input i.e. listening and reading. And I’m talking about keeping a language up to speed, not getting it up to speed from zero.

I guess that 10 minutes every other day could do it. And so a total of an hour a day would work for a dozen, 2 hours for a couple of dozen. It’s a fun thing to dream about. 

Yet it isn’t a dream.