The volcano twilight tour was long, but very interesting. The total time it took was almost exactly 12 hours. The return to the starting point alone took 3 hours, so considerable travelling was involved. Our guide, Maka, was articulate and knowledgeable, and he made every possible effort to answer questions and consider the comfort and enjoyment of the passengers.
Do not expect to be close to any lava; the closest we came was seeing the glow in the distance after dark.