FATMAP difficulty grade
Lanin volcano, a large conical stratovolcano shared among neighboring countries stands tall as a guardian of the border. This giant's elevation is 12293ft (3747m) and demands good fitness and good skinning skills.
"The most recent eruption took place about 2200 years ago and produced a small lava dome at the summit and a block lava flow to the north." (https://www.volcanodiscovery.com/es/lanin.html) An average of 12hrs.
back to back is a good estimate, anywhere near considering conditions.
Southern alpine conditions always present. Contact the local guides in Pucón for adventure programs.