In my district, you go straight to the principal to request an evaluation. By law they have to complete it within 30 days (regardless of where you live). My son is in special education, so I'm very aware of the procedures.
once the permission to evaluate has been signed the district has 60 school days to complete the evaluation. When a child has been found to be "exceptional" they have 30 calendar days to complete the IEP. This is per Individuals with Disabilities Education Act (IDEA) - (Federal Law)