If you are in reasonably good shape, a 12-mile round trip with 5000 feet of vertical elevation gain should be doable in 8-10 hours. Pick a good weather day, and note the forecast carefully to avoid getting into trouble. Water is hard to come by, you'll go through 2 quarts easily. And take a couple if extra layers, as the temperature on the summit will be 15-20 degrees below that at the trailhead, and likely windier as well.
My summit day was fabulous. Visibility from Mt Scott (Crater Lake) to Mount Adams.
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