Brain teaser #13

@soldenski (2504)
United States
January 31, 2007 11:23pm CST
On average this lasts 5 1/2 weeks. What is it?
1 response
@Mayuko (1271)
• United States
20 Jan 12
I'm not sure. I'm thinking maybe the gestation period for an animal, but I don't know what....