I wouldn't use more than 2-3oz of the chips soaked in 2-3 jiggers of plain vodka in a tight lidded container in the fridge while the beer is fermenting. It took mine that long to soak up 2/3's of the 5 jiggers of Beam's black I soaked them in. So 7 or 8 days is pretty strong. So 2-3 oz chips to 2-3 jiggers vodka in this case should be a bit less intense at 5-7 days in secondary.