Seriously, more than a year. One of the hand sanitizers that was tested had as much as 16.1ppm benzene. That's not great, as it's believed that some small port

Seriously, more than a year. One of the hand sanitizers that was tested had as much as 16.1ppm benzene. That's not great, as it's believed that some small portion of benzene a person is exposed to can be absorbed through the skin, but... yeah. 16.1ppm. Gasoline can contain on average 0.62% benzene, and it evaporates quite quickly. Gasoline vapor is genuinely dangerous to human health. (demonstrably less so now that we've stopped putting tetraethyl lead in it, but still)