It varies a lot. Everyone has different career and learning schedule so there is not a standard length for completing a phD (for any subjects in general).
My aunt finished her phD in linguistics at U of Connecticut about 15 years ago and it took her 5 years to finish all the courses and essay.
It takes 1 year.
About 88 days
24 hours
It takes 24 hours for one complete cycle.
IT TAKES 243 days.
it takes 1 day
it takes 1 day
The Earth takes approximately 24 hours to complete one full rotation on its axis.
Saturn takes about 10.7 hours to complete one full rotation on its axis.
It is called a year because it takes that much time to complete one orbit of the sun.
it takes 9 hours and 56 minutes.
it takes 17 hours and 14 minutes.