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.
In Dec it took 5 days after the last pill for me to get my period. Then in Jan my period had not yet come so I again took provera and got my period 3 days after. I think Provera usually produces a period within 3 to 5 days after the last pill. If you do not get a period with provera then you most likely are pregnant.