Link: Selling Projects in Blocks
Summary: Sell your time by the day (as blocks of time) and use the increased flexibility to have a life. Using this method, clients can know project length (in days, or months) and approximate cost. Since you’re only selling 4 days a month, you’ll hopefully have one day a week to work on the other stuff on your plate.
While I really like this idea, it does not work for us at Tornado because we have so many clients and so many projects and we handle ongoing work for most of them. It could work for you, though. Especially if you have only a few clients / projects per month.