Drupal 7 number quizzes

Here are quizzes on magical numbers related with Drupal 7.

How many numbers do you know of them? If you already know all of them, you're an awesome Drupal master certified by hgoto (me)! (But there's no certificate :) )

21 (days)

The default session expiration time. After 21 days (actually 2,000,000 seconds) since the session was created, user sessions expire.