We would like to hike Mt. Huashan about 4-5 hours. What would your suggestion be?

Well, I suggest you climb up the mountain at night time, so that you can see the amazing sunrise view. To catch the right time, you are supposed to start to climb at 10pm at night.

When you go down the mountain, you are suggested to take the Zhiqu HS Passage way, it is thrilling but fast, You can get down from the north peak to the mountain foot in an hour. Have a try.