I ran through the kourend quest and mountain daughter. Both took between 20-30min to complete. Didnt watch it necessarily so i cant report how well it used the stamina potions. But it looked to be pretty effecient. mecient from what I was observing in the checkpoints I was monitoring the two quests.
Side Note: It doesnt seem to recognize Dragon Slayer, Shield of Arrav, and Shade of Morton Skips over the