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.
I took Provera last month so I could also start Clomid also. My Dr. said it could be up to 10 days before you start! For me it brought on the worst, heaviest period I've ever had. My first Clomid cycle was unsuccessful.