It took us around one and a half hours to reach the final waterfall moving at a pretty steady pace. There is a forest path we took back found on your right-hand side if you facing downstream. If got us out in around 30 minutes, however, it was fairly overgrown and if it got much worse would be impassable.
*There is potential of suck holes at some gaps between big rocks when water flow is high. Those spots are seen at upper layer of the gap where creek water goes through rocks. *Nan'ao North River is notorious for flooding and dangerous suckholes(You need to pass it to the creek leading to Fan Waterfall). It's also sensitive to afternoon downpours. Forecast must be checked before setting off.
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This is a quick and fun trace. Lots of pools to swim in and a wonderful waterfall at the top. It is less popular than some of the more commercial routes in the area so it's a good one to visit if you want to avoid crowds.