How long did Lanza's shooting spree last?
We don’t seem to have the whole story yet, but I believe it was under 20 minutes.
He seems to have fired at least 100 rounds, and I think it may have been more.
What the rate of fire was in any given period was, or what opportunity the victims had to escape, etc. are still unknown.
I’ve heard several reports - and seen a timeline - setting the time from Lanza’s entry to suicide as ten minutes.