Witch marge .....really???!!!!!
It's nothing amazing.. Think off the top of my head its a 4 hour job and when complete knocks 4 additional hours off whatever you're growing.
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45 days, but that would require constant re-tasking of Marge, so allowing for missing it due to sleep/work/other plans, plus any quest lines that Marge is needed for, about 60 days maybe?
