30 seconds to 1 minute of contact...iso and plant material...will give you the cleanest/clearest/reddest oil in the end. the longer the iso stays in contact with the plant material..the more chlorophlly it will strip out and impart in your oil...and the greener it will taste.
Get EVERYTHING ready before you start. The weed..the vessel to shake it in...a screen/mesh/something to use to pour the iso out of the jar/into the glass baking dish and so you casn squeeze the leftover plant material and only get the liquid in the dish. you DON'T want any plant materiasl in there, so whatever it takes to do that...and QUICKLY...is what you should use.
Follow?
weed in jar...shake for 30 seconds...filter liquid into dish....evaporate liquid in dish (heating pad works well. NO FLAMES! NO FLAMES!)...scrape up goo goodness. The warmer it is the more fluid it is.
"all' leaves, shake, etc (no stems) can be used. The more trichs present..the more end product...
good luck
bt dt