It takes everybody about 21 seconds to pee.

That’s everybody—you, me, the cat, the cow and the elephant.

Researchers at the Atlanta Zoo found that all mammals that weigh more than six and a half pounds take about the same time to empty their bladders: 21 seconds (plus or minus 13 seconds).

“Once you get above the squirrel-mouse-shrew level,” writes Karen Hopkins in Scientific American Magazine, “tinkle-time does not scale with body size. Good news for elephants, who could otherwise spend all day going number one.”

Before you conclude that this is another nugget of useless information, consider that this finding helps hydraulic engineers design systems to rapidly drain reservoirs, regardless of size.