The "day" on any object in the solar system is very nearly the length of time
the object takes to rotate on its axis ... or the length of time between as seen
from its surface.
The "asteroid belt" is a loosely contiguous group of millions of individual objects,
and each one has its own "day".
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If you mean "how many hours are IN one day", then there are 24 hours in a day.
24 hours are in one day...:)
There are 24 hours in a day.
There is 24 hours in 1 day!!
24 hours a day