Saw this website.  This is a cool/good idea. 

Five.sentenc.es

The Problem

E-mail takes too long to respond to, resulting in continuous inbox overflow for those who receive a lot of it.

The Solution

Treat all email responses like SMS text messages, using a set number of letters per response. Since it’s too hard to count letters, we count sentences instead.

five.sentenc.es is a personal policy that all email responses regardless of recipient or subject will be five sentences or less. It’s that simple.