Most of the time when I do this hike I go up from the north parking lot to the summit then down to the southern parking lot or southern park entrance and then back again. It's about 30 minutes from the north parking lot to the summit.
Quick hike, saw lots of families. Had great views at the top along with a nice conversation with a fella manning the lookout tower. The 60 degree weather was a nice break from the 100 degree heat in the south.