Let's be honest, coding is really only half the story. There's lots of deployment, debugging, and maintenance work that is much fuzzier and harder to measure. In fact, if you are actually actively coding for more than half your time, you're either really lucky or you don't have any users yet.

You can (or at least they'll assume you can) if you have input into your own deadlines: they'll say you're padding your estimates.

I love when non-coders tell me how long a coding task should take. This is one reason why I decided to work for myself.