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.
To make sure you're not pregnant when you're injected with Depo-Provera, your health care provider will likely do your first injection within five days of the start of your period. If you've just given birth and you're not breast-feeding, your first injection will be done within five days of giving birth. If you're breast-feeding, your first injection will be done six weeks after you give birth. You can start Depo-Provera at other times, but you may need to take a pregnancy test first.