Sorry about that. In certain expressions, including plus __ plus ___ and de plus en plus, pronouncing the s at the end of the plus is optional. (Unless of course there's a required liaison, as in de plus en plus.)
The general rule is that s at the end of the French word plus is pronounced when it's positive, and not when it's negative. So,
J'ai plus de temps = I have more time = s is pronounced.
Je n'ai plus de temps = I don't have any more time = s is silent.
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