We spent two days in Lower Antelope slot canyon (about 3 hrs. each day). This one is less traveled and a little quieter than Upper Antelope slot because all of the tours from Page go to upper. You can drive right to this one and have guided or unguided walk throughs. Middle of the day is the best time and even then the lighting is subdued so bring a tripod! It's dusty down in the slots so try to minimize lens changes or better yet take two bodies with the lens you need and don't change (wide angle is usually best. I can't imagine needing much more than 100mm).
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