Users can also manually adjust the stun duration by going into the SMF zip, SESTUN/content/chunk0/serpentstun.entity.patch.json
Edit the value setting to however many seconds you want NPCs to be stunned for.
{"patch": [{"SubEntityOperation": ["a4de2f516fe74e68", {"SetPropertyValue": {"property_name": "m_StunDuration", "type": "float32", "value": 86400}}]}], "patchVersion": 6, "tbluHash": "00BB0E8D2CF65804", "tempHash": "0049082339F7C4E2"}


I am aware vadjeee already made a mod similar to this one previously, but both the RPKG and SMF versions of his mod no longer work.
I spent a bit of time learning H3 modding just to remake the mod, and since its remade, might as well upload it.