Took 12.5 hours and 14% propane (~18 gal.) to reach cone 9.5 (10″ max water column gauge pressure). Did 40 minutes of light reduction at the end (6″ water column gauge pressure and burner air completely closed)

Volcano, Hawaii
Took 12.5 hours and 14% propane (~18 gal.) to reach cone 9.5 (10″ max water column gauge pressure). Did 40 minutes of light reduction at the end (6″ water column gauge pressure and burner air completely closed)