I use 35 psi and without shaking, it takes a week to carbonate. I also use 20 feet of 3/16ths beer line to minimize carbonation loss.
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