Well, the answer to that question for many women at 36 weeks who have swollen ankles and can barely move is
“too long!” The real answer is
that it varies by species. The average pregnancy
for a hamster lasts 15-17 days and for an elephant 600-660 days. For humans, the average pregnancy lasts about 280 days—or 40 weeks—from the first day of the last menstrual period (LMP).