I know from experience these little monsters are fast:
A turnstile-jumping tot, who can't even speak yet, gave his mom an 11-minute scare Tuesday when he slipped out of a Queens restaurant and jumped on a No. 7 train.
Olivia pulled her disappearing act when she was 4, stayed gone for about five minutes until I found her a few dozen yards down the beach. I called it a "powerful, cheap lesson."