E-mail: Is that where all the time goes?

Email is a big time cost that I probably don't account for properly in scheduling my daily activities.

Just look, left, at the timestamps from the emails I've sent out over the last few hours.

Am I spending too much time in writing every email? What is the right amount of time to spend on each email?

And then there is the time required to think about other people's emails -- to digest, and think about their thoughts and words.

If only it were possible to send emails at the speed of thought. Just as email revolutionized snail mail, perhaps that's the next big revolution?