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Best Answer: It takes Earth approximately 24 hours to make one rotation. It also takes about 365.25 days to make a whole revolution around the Sun. Commonly, a rotation is called a day and a revolution is called a year. Source(s):
Â· just now. Report Abuse. The Earth makes a full rotation in a 24 hour period, which makes a whole day. And a full orbit of the sun takes 365.25 days, the .25 being the extra day of the leap year that comes every 4 years. And for your other question, I don't think that time can increase or decrease.