I agree with the others that a comfortable long term savings rate is the baseline goal. I think it's good to test yourself by incorporating extremes sometimes too. I've done no spend months before (except normal monthly bills, of course). Next month, or january, I plan to see how low I can go on groceries & food, since this is one of my less well done budgeting areas. The goal is to establish better spending habits, and experiment to see what works and what doesn't, so hopefully, some of the takeaways can be incorporated into my long term budget.