How long does it take a coronal mass ejection to affect radio propagation on Earth?

A Coronal Mass Ejection (CME) is a massive burst of plasma and magnetic fields expelled from the Sun's corona. Because these charged particles have physical mass, they travel much slower than the speed of light. It typically takes a CME between 15 hours and a few days to cross the 93 million miles of space and impact Earth's magnetosphere, where it can cause geomagnetic storms and disrupt radio propagation. In contrast, electromagnetic radiation from a solar flare travels at the speed of light and affects Earth's ionosphere in just 8 minutes, which is a common distractor to watch out for.