0. If you are trying to get a PA for a prescription it generally takes 24-48 hours, excluding weekends for a decision.If you are trying to get a PA for a medical service it could take up to 60 days. Generally, if your provider provides all information to Iowa Medicaid the timeframe is generally 10-15 business days.f you are trying to get a PA for a prescription it generally takes 24-48 hours, excluding weekends for a decision.If you are trying to get a PA for a medical service it could take up to 60 days.