We believe that earth takes 24 hours to spin it, which gives us day and night. We don’t have 24 hours a day as we follow. We run short of 3 minutes and 56 seconds a day! The actual time is 23 hours, 56 minutes and 4 seconds. However, the duration of a day can be extended by 1.5 hours extra. This could happen after 250 million years and caused due to slower rotation of the earth.