Sessions run for up to 50 minutes, depending on the kind of help you need and want. In other words, it's entirely up to you. We're here to help you improve as a writer, which means helping you to think critically and make reasoned decisions about your own writing - not making those decisions for you. So of course we're done when you say we're done, though we might encourage you to stay awhile longer and help you to see why. We might also suggest that you schedule another appointment at a later date to address other issues with your writing.