There's some variation on that... but we were told the same timeframe... the explanation being that it requires a certain level of maturity to be able to focus on that intensity of a test. It also allows time for ADHD/ADD to show up - and if its there, to be treated... but that is a bit of a catch-22, because Auditory Processing Disorders (APD) can also look like ADHD.
Don't take her to a regular audiologist, either... make sure the person doing the testing is familiar with the full spectrum of APDs.
