In which I discuss the M word

I received this email the other day and thought my answer to the sender was something more people might like to know about, so I asked permission to post some of it and here it is.

Dear Michelle,

I have some questions I hope you can answer, if they are not too private I mean. I have always wanted to write full-time. But I'm worried that I won't be able to write a book fast enough. On average, how long does it take you to finish a project? Does a writer's deadline depend entirely on the...