Generally, it takes between seven and 10 hours for a dog to digest food, but the many variables mean that only your vet can tell you how long it should be taking.
But how many days after Provera will your period start? When using Provera for amenorrhea (absence of menstrual periods) or abnormal vaginal bleeding, the medication is taken for 5 to 10 days. Menstrual-like vaginal bleeding usually occurs three to seven days after treatment ends.
Provera and Ovulation Stimulation. When prescribed for women trying to get pregnant, Provera is usually given for 10 days. After that time a woman can expect bleeding from two to 10 days later.