A lunar eclipse doesn't last for a few hours, it can last for several hours, sometimes even up to an hour and a half. The duration depends on several factors:

* The Moon's Position: The farther the Moon is from Earth during the eclipse, the longer it takes to pass through the Earth's shadow. This is because the Moon's apparent size is smaller when it's farther away.

* The Earth's Shadow: The size and shape of the Earth's shadow also affect the duration. The umbra (the darkest part of the shadow) is where a total lunar eclipse occurs. The penumbra (the outer, lighter part) is where a partial lunar eclipse happens.

* The Speed of the Moon's Orbit: The Moon's orbit isn't perfectly circular, so it moves faster when closer to Earth and slower when farther away. This affects how long it takes to traverse the shadow.

Here's a breakdown:

* Total Lunar Eclipse: During totality (when the Moon is completely within the umbra), the eclipse can last for a maximum of about 1 hour and 47 minutes.

* Partial Lunar Eclipse: Partial eclipses can last longer, with the entire process from the Moon entering the penumbra to exiting it taking several hours.

While a lunar eclipse can last for a significant amount of time, it's still a relatively brief event compared to other celestial phenomena.