I would not ever ride without eye protection. But I'm a bit paranoid about my eyes. I wear protection when mowing the lawn, using any tools including hand tools (I've had chunks snap off of screwdrivers and hit me in the face), etc. With comfortable safety glasses, I forget they're even on. I've found myself walking around stores still wearing safety glasses, having forgotten I was wearing them.
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Work: the 8 hours that separates bike rides.