A lunar eclipse as seen from Earth is leisurely,
taking three hours or more.
When the moon enters the umbra,
a dark biteout appears and grows - the partial phase.
When the moon is entirely inside the umbra,
totality begins and can last for an hour or more.
The moon appears red because the only light reaching it
is refracted through Earth's atmosphere.
One side may be brighter than the other because it is closer to the edge of the umbra.
When part of the moon emerges from the umbra, totality is over.
When all of the moon emerges, it's the end of the eclipse.