User blog comment:Sannse/Blocking Best Practices/@comment-5179062-20121018175909

For Registered users, I block about 5 minutes for each useless edit

For Bots, it's 1 hour.

For Unregistered users, I block about 15 minutes

On 2nd/3rd/4th/further offenses, I block 1 hour, 7 hours, 3 days, and a week.

Usually, I give warnings before blocking though