I TAKE IT...
i take it that you have search long and hard and, far on the hive, and other numerous sites to find this info, or you are just lazy... either way" fucked if i know"
CHECK THESE OUT AND YOU MAY LEARN SOMETHINK:
https://www.thevespiary.org/rhodium/Rhodium/chemistry/3base/safrole.plants (https://www.thevespiary.org/rhodium/Rhodium/chemistry/3base/safrole.plants)
http://www.fao.org/inpho/vlibrary/x0043e/X0043E0G.HTM (http://www.fao.org/inpho/vlibrary/x0043e/X0043E0G.HTM)
It may be anywhere from 65 to 90% safole, and for the time, i am unsure perhaps a few hours and i mean a few hours remember you are distilling from bark... so make a coffee and have some cake and then sit back, watch some porn, or simpsons either way it is a steady process"