How long does it take to get a visa for a spouse?

If you have a wife or husband kids or no kids living in the Philippines and they are all Filipino Citizens and your the American Citizen. The process generally takes from 9 to 12 months, depending on if the married couple has received their certified marriage certificate? There are many key factors as to why it can go more than one year based on birth certificates, passports, police records and medical examinations?