Really depends on what your spending habits are. I agree with
@MemeLord that housing ends up being the largest expenditure for most folks, so cutting down there can lead to large increases in discretionary income. Without knowing your lifestyle, financial goals, anticipated debt burden, and future expectations, it's hard to give you a ballpark figure.
For myself, I enjoy traveling and trying out fancy restaurants, though otherwise don't mind "living like a resident". I want to achieve financial independence by the age of 50, and to guarantee that my children will not need to go into debt for school. This would not be achievable on $60k / year (which I'm sure many people can live comfortably on), but is very doable with an attending salary. To figure out what you need to achieve your ideal lifestyle, you need to crunch some numbers.