How long is a day on Mimas?

About 22.6 Earth hours · orbits Saturn every 0.9 days

The moon with a giant crater that looks exactly like the Death Star, orbiting in 23 hours

Mimas has the Herschel crater - 130 km wide on a 400 km moon! It looks EXACTLY like the Death Star from Star Wars! The impact almost destroyed Mimas. One more hit that size and it would have shattered!