Depends on the species.
mice and rats are pregnant about 3 weeks while elephants average 92 weeks - nearly two years.
A horse's pregnancy typically lasts around 11 months, or roughly 340 days on average.
The average pregnancy for any breed of dog lasts for 9 weeks.
The average Dog pregnancy lasts for around 9 weeks from time of conception.
About 280 days. Typical pregnancy is 40 weeks. 40 weeks x 7 days a week would be 280 days.
A pregnancy usually lasts for 9 months
a full term pregnancy lasts 40 weeks
A pregnancy lasts for approximately 40weeks
Hedgehogs are pregnant for 32- 42 days. Average pregnancy lasts about 35 days. 1-10 babies maybe born to Algerian and African Pygmy Hedgehog breeds.
Approximately 10% of pregnancies end in preterm delivery, defined as a delivery that occurs before week 37 of pregnancy (the average pregnancy lasts 40 weeks).
The pregnancy lasts for 60 days
Around the end of January 1988, it is impossible to be precise but the average pregnancy lasts 9 months.
The average dog pregnancy lasts 63 days. It can be a few days longer or shorter.