Undoubtedly.
Undoubtedly, some people who have been traumatized are never able to articulate effectively, either because of mental health problems or because the traumatic experience was so difficult they don't want to talk to people about it. A classic example would be the rape victim who is very uncomfortable about talking to an individual about these issues.
If the eight days initially is simply a matter of collecting biographical data--a person's name, where they come from, etc.--that is much different from the eight days including a substantive questioning series about matters that would go to the substance of a claim.