I keep track of everything so it's reflected on my invoice. And I bill in 6 minute increments, too. But for stuff like that the hourly rate is always zero. It shows up on the invoice as "NO CHARGE." Clients love that ####.One key is how hours are billed. I have a buddy who is a lawyer, and the minimum he charges is 0.1 hours. So every e-mail he sends he charges at least 0.1 hours. So if he types one sentence and it takes 30 seconds - that's 0.1 hours billed.