A cat's pregnancy (gestation period) typically lasts about 63 to 65 days, roughly two months

. When it comes to the actual birth process (labor and delivery):

• The first stage of labor, where the cervix relaxes and contractions begin but are not yet visible, can last up to 36 hours, especially in first-time mothers

• The second stage, active labor with visible straining and delivery of kittens, usually sees each kitten born within 5 to 30 minutes

• The third stage involves passing the placenta after each kitten, often immediately following the birth of each kitten

• The total time for a cat to deliver all her kittens is generally between 4 to 16 hours, but it can last up to 12 hours or sometimes longer if labor is interrupted

• Intervals between kittens are typically 10 minutes to an hour, but cats can rest between kittens for up to 24-36 hours if needed

• Most cats deliver their entire litter within six hours after active labor starts, but longer labors are possible and should be monitored closely

If a cat strains for more than 20-30 minutes without delivering a kitten or if more than 3 hours pass between kittens, veterinary assistance should be sought

. In summary, from the start of labor to completion of birth, it usually takes between a few hours up to about 12 hours, with the entire pregnancy lasting about 63-65 days