One of the blogs I follow is by Todd Heistand. He is a tri-vocational pastor (not counting the additional two vocations of husband and father!) and his community is called The Well which is in Feasterville, PA. (Not to be confused with The Well in Orange County, CA that I have blogged about previously, which is a community intentionally transitioning into a network of cells.)
Todd recently posted a very open description of his weekly schedule and wondered aloud about it's sustainability long term.
In my mind, I think he's raising a broader question, not about the sustainability of pastoral life per se but about the sustainability of a congregational life that's built upon unsustainable leadership expectations. Maybe part of the problem is what we assume is required for congregational life, in particular, weekly large-group presentational worship services.
Here is how I presented the question to him: