Sasha
Google
Beautiful track!
Although the visibility was poor when I visited, the track itself is amazing and the lava caves were fantastic to see!
I took the 10.30am ferry, and it took me (relatively young, fit, and healthy) 40 minutes from the wharf to the summit, 15 minutes to walk the loop around the crater, 30 minutes to the lava caves then 20 minutes exploring the lava caves, and 30 minutes back to the wharf leaving me woth half an hour before the 2.20 ferry
It was quite physically demanding! And very warm due to the volcanic rock but well worth it!