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As many as the designer likes, but the average table fan uses about 20 watts.
That will depend on the specific fan.
Generally, a floor fan uses 90 watts to employ itself.
A simple fan runs on about 15-20 watts. It does that continuously while it's running. If it runs for an hour it will use 15-20 watt-hours of energy.
Not very much... A large ceiling fan (approx 56" in diameter) uses about 85 watts.