People who are saying an hour are probably walking at a relatively slower pace. I have timed myself from 35-45 minutes to get to the end on the shortest route. (Crossing at the beginning of the trail and stating on the left the whole time). If you don't stop, you could do it in 30 minutes each way.
Depends how long the trail you take is probably an hour but longer if you stop to see wildlife.
Probably close to 1h each way taking your time... The water crossings are however at the begining so it gets fun quickly.
Depends on what trail (their are 3) you take.
Depends on where you start which trail you take , and also how long you take to walk most of the trails go through a few miles
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