Question

What is the exact time of a full earth rotation?

Answer 1

The exact time is  23 hours, 56 minutes, and 4 seconds. hope this helps hun

Answer 2

Partyrockchickk is on the right track, but 23:56:04 is not exactly exact.
23h 56m 4.0906s is closer, but still not exact. You'll never see an 'exact'
number written anywhere. First because it doesn't work out to an exact
decimal of anything, and second because it changes ! The Good Friday
earthquake in Alaska changed it, the Fukushima earthquake changed it,
the Nepal earthquake changed it, and the daily drag of the tides changes
it by something like 0.001 second every century.

One thing's for sure:  It is definitely not 24 hours.