Six Months.
Sam took Six months to work on the project and he only made some minor developments. The genetics of this world is much more complicated than he thought.
If only he had the wood elemental, it would have been more supportive. But this one genetic development helped him in many fields like inscriptions and formations. He made significant development in both fields.
Anyway, the current genetic project is actually related to the old friend he didn't meet since the beast faction.
It is nothing but the soul-devouring vines.
He met with this old friend and did all kinds of genetic experiments on it for days and months. He tried to use several other plants to graft, to add extra charges that would be sufficient for his own operation.
After hundreds of tries, he finally managed to find a match for this.