Between 4-5 hours one way. Plus you'll want some time in the spring
We went during the tail end of the dry season and even then the water was strong in a few places Falling rocks, especially on the trail leading to the river
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A long way to go but definitely worth it. The whole trip is gorgeous and at the end, you are rewarded with a cliffside hot spring that looks down onto the river. Many people do this as a two-day trip and camp near the hot spring. Personally did it in a day but it's a good 10+ hour round trip so you'll need to start early. The starting GPS location will get on to a trail that you can take a scooter along almost right to the river. Follow upstream to the ending GPS location and look for the hot spring in the cliff. There are tails along the right side of the stream at certain points you can use to move a little faster if you want. It is also worth noting that there is a beehive at the back of the hot spring. They are honey bees though and shouldn't bother you if you don't bother them.