How often should I use the humidifier for my desk plants?

I have set up my desk humidifier and I've been running it once a day to give my plants a shot of humidity. Am I overdoing it? Should I do it more often?

The humidifier is a little USB one and runs for a couple of hours before it runs out of water. I know it's not the best solution, but I figure it's better than just leaving a glass of water close by. Any advice is welcome.


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