SWR of 6.21% for 26 years
If you retire now (at S&P around 1100), your SWR should be about 6.21%, given the assumption that the 30 yr period 2000-2029 would not be worse than the worst 30 year period from the past.
Reason: If you had $1000000 at the beginning of 2000, FIRECalc will tell you that your SWR for 30yrs is 4.19%, using the defaults. If you stick to 4.19% withdrawal, at the end of 2003, your nest egg will be about $674000. Yet, you should be OK to continue withdrawing $41900, plus inflation adjustment til 2029. Hence, if you had $1mil at the end of 2003, then you should be able to withdraw $41900*1000000/674000=$62166, or about 6.22% annually, inflation adjusted. Of course, if you believe that 2000-2029 period will be worse than the worst we've ever experienced, then your personal SWR will be less than that.