13
The standoff began on 28th February 1993 and ended on 19th April 1993, a total of 51 days inclusive. (c.f. http://www.culteducation.com/waco.html)
two
it may vary. a week or so
3 days
Ovulation has a 3 days window. Day one you are beginning to ovulate, day two you are ovulating and day three you are finishing ovulation. During this time there is a high risk of pregnancy.