How long is a day on Hydra?

About 10.3 Earth hours · orbits Pluto every 38.2 days

Pluto's outermost known moon, tumbling rapidly with a 10-hour day

Hydra is Pluto's outermost and largest small moon, and it spins incredibly fast - completing a rotation in just 10 hours despite being 5.5 billion km from the Sun!