Does he use "less" as a verb here? Where's the verb in this sentence?
No, "less" here is used as a determiner since it comes before the noun "time". The verb is actually dropped in this case. The verb should be "spend" and the full sentence should be "spend less time in the shower", however the verb "spend" is dropped here because it is already implied. This is because the common verb that goes with doing something related to time is "spend", so the verb is already known and it is dropped to make the sentence shorter and faster to say.
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