Lawyer James Conway describes the art of billing on the site JDs Rising:
This is very simplistic, but you only get paid for things you actually bill to the client. If it doesn’t make it onto the bill, you won’t get paid for it. Remember that quick email you sent from your blackberry? Bill it. Remember that “two-second” question that turned into a ten minute diatribe? Bill it. Remember when your partner walked through your open office door and you had a twenty minute brainstorming session on litigation tactics? Bill it. Unless you express your time, you can’t get paid for it. Further, unless you describe all of your work, your client doesn’t understand all the value you are providing for the fee that you charge.
No wonder people hate lawyers.
It’s not that the “client doesn’t understand all the value you are providing.” If the lawyer thinks that the value comes from the time spent sending a quick Blackberry email, then the lawyer doesn’t understand the value. A lawyer (or any other professional) who understands value prices it. Everyone else just measures time and bills it. And annoys the hell out of their clients.