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 always got a withdrawl bleed on Provera, as soon as 3 days after the last pill and as long as 8 days afterwards. I only got very light spotting on Prometrium (which made me really dizzy and tired) so I didn't start my clomid thinking that a heavier flow would soon follow, but it never did.