See Mercury's giant, comet-like tail in stunning new image as it passes close to the sun

Others reported Mercury's tail from 2021. https://spaceweatherarchive.com/2021/05/10/the-sodium-tail-of-mercury/

This report indicated the tail is some 24 million km long, "The escaping gas forms a tail more than 24 million km long.", close to 0.16 au or larger. How long has this process of sodium lost been taking place? Consider that Mercury completes more than 4 billion revolutions around the Sun in 1 Gyr period. How much sodium does Mercury lose?