I'd start with 8 oz., but buy a pound. Since you're drinking it without waiting for it to age and with that high an ABV, you'll probably need the extra.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk