If it's your first time atleast 6 hours because you will be stopping slot to take pictures.
The Big Loop is 9.5 miles with almost 3 miles considered "strenuous". The elevation is 5700-7100 feet so most people will need to taking it slower than their normal pace. Most people will take 6+ hours. The Echo Canyon loop, another popular hike is moderate, 3.3 miles and may take 2-4 hours.
Typically 4 to 6 hours but will vary widely.
2 hours.
Thanks! Your answer is awaiting moderation.