We didn't specifically ask those questions, but what we do know is that often mental health issues, particularly PTSD, take a period of time before the symptoms rear their ugly heads, so to speak. That is one reason why it takes 11 years. The other reason why it can take 11 years is the fact that veterans have great survival skills, so they can kind of get through on their own for a while before things get out of control.
On November 22nd, 2018. See this statement in context.