Three weeks is plenty of time for all but and imperial or barleywine. Hit it with a good starter. I'd shoot for a OG under 1.050, more for faster conditioning than anything.
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