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Try http://networthify.com/calculator/earlyretirement for a fairly straightforward, income-independent answer to that question. Tell it your annual income and expenses, and it'll tell you when you can retire. Adjust the numbers and your retirement date changes. (The defaults for "return on investment" and "withdrawal rate" work pretty well.)
Whenever I see one of these retirement calculators I don't understand how people save enough to actually retire. Are most people really socking away 25%+ of their gross income every year?? I certainly enjoy motorcycles and exotic travel far too much for that to ever become a reality (not to mention pay rent in the Bay Area and try to maintain an organic/local-sourced diet which costs about double a typical grocery st…
My wife and I are in our mid 30's, put away about 15% of our income and have defined benefit pensions that we contribute 7% into.
It's totally doable. Last year we spent two weeks in Hilton Head and paid about $80/night, we drove from New York to save about 80% vs. flights/car rental. We live in the city we work in and I commute via bus.
It's also totally worth it. We're living we'll now, and will be able to retire in our late 50's with a paid off house. I will not be the guy in his mid 60s trying to hang on to his job.