The amount you need is in no way related to your current income, other than that it will probably not be less than 30% or more than 150%. It will, however, be more closely related to your current expenditure.
You don't say how long you took to acquire your $725K in savings, nor how long your income has been as high as its currently level. If the answer to both is "not very long" then you're probably in better shape to ER because you have recently been saving a lot, which implies that you aren't spending a lot.
A quick way to see what you've been spending if you haven't been using Quicken (etc) to keep detailed track of expenditure, is to take your income last year, deduct taxes, and deduct the amount which you socked away in savings of all kinds. The rest... you spent. Let's say that's $80K, to pick a completely random figure. Think about the five biggest items you spent money on last year. Could you do without two of them? Three? Obviously, you can go into more detail later.
The good news is...
Originally Posted by infoseeker
Hello all. This idea of quitting work before age 65 is all new to me......
... that you've made the first step. I am utterly amazed at the number of people who haven't considered the idea that they can decide, themselves, when to stop working. It's as if they think that there's a law that you have to be at work until 65 in the same was as there's one saying that you have to be in school until 16 (or whenever it is). In fact there are many ways in which people "never seem to leave school", in terms of control over their own lives, but that's another rant...