It depends on the age of the baby. According to Dr. Richard Ferber in his book "Solve Your Child's Sleep Problems" it can range anywhere from 11 to 18 hours for kids 12 months to 1 week, with the younger child sleeping more.
And for a one-week-old, it's divided into 8 hours of nighttime sleep and 8 hours of nap. As the child ages, nap time sleep decreases, while nighttime sleep hours increase.
See the chart on page 10 of his book for more information.
A new born can sleep as much as 16 hours a day or even more.
16 hours
Babies sleep when they are tired. They usually are awake for two to four hours at a time when they are new borns.
2-3 hours
How many hours does it sleep
Babies need 18 hours sleep, Toddlers need 12 hours, Children need 10 hours, Adults need 7 hours. I however (Being eleven), think that an eleven year old needs between 9 - 10.
they sleep for 10 hours a day they sleep for 10 hours a day
A newborn may sleep as much as 16 hours a day (or even more), often in stretches of 3 to 4 hours at a time. And like the sleep all of us experience, babies have different phases of sleep: drowsiness, REM (rapid eye movement) sleep, light sleep, deep sleep, and very deep sleep. As babies grow, their periods of wakefulness increase. At first, though, the need to feed will outweigh the need to sleep. Many pediatricians recommend that a parent not let a newborn sleep too long without feeding. In practical terms, that means offering a feeding to your baby every 3 to 4 hours or so, and possibly more often for smaller or premature babies. Breastfed infants may get hungry more frequently than bottle-fed babies and need to nurse every 2 hours in the first few weeks.
they need about 6 hours of sleep
Elephants sleep for 2 hours
if you mean how many hours you should sleep in a year it would be 3,650 hours of sleep for a regular year not a leap year
babies get to sleep just the way we do
They sleep upto 18 hours a day.
about 10 hours of sleep