It's realistic if you're on track for retirement savings.
If you don't have it, and you're living paycheck to paycheck, dial back your spending so that you can put away 3 - 6 months of savings. You need that cushion for unexpected events. It's part of a complete financial plan.
What's with your sudden obsession over income, savings, and retirement?
You're starting a lot of threads asking basic questions. You should seriously consider getting a financial advisor. This is precisely the kind of thing for them to guide you through.
If you're just discovering that you should have 3-6 months of savings, and that you should be putting away 15% of your salary for retirement, and all the other basic elements of financial planning, then instead of polling a site focused on oil, get real, professional advice.