Ahh, it's somewhere in the low 90s. Depends on the wind, of course, elevation, etc. The below chart (90 mph = 325 feet) is for throwing, but the physics is the same.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .