No, it's not "bad" but it costs you a great deal more in electricity.
I have a 2-speed-converted 1 hp superpump that I run only on low 24/7. It's as cheap as running a regular speed pump on 8 hours of timer. Definitely use a timer if you don't have a 2-speed or variable speed. You might even want to do so if you have a low speed option, though most of the saving comes from getting off the high speed pump. I use a standard intermatic pump timer when I choose to run the pump on a schedule-- never have to worry about it!
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