Mman is right here. It is VERY common in the real world to find specialty MDs over that range. Most that I know have a spending problem. I know a couple guys making 1.5+ while also somehow living paycheck to paycheck. Not at all impossible to retire within 10 years if your expenses are low.
With regards to your question, there is a small dependence on your investment decisions. If you want a noninflation adjusted 100k/year, you only need 5 mil sitting in a bank account to live to 80 as an average aged new attending (5 mil/100k=50 years). Nobody does that, please see bigern's guide on safe withdrawal rates for various investment scenarios.
The Safe Withdrawal Rate Series: A Guide for First-Time Readers
I would encourage you to re-evaluate your life to find a way to continue your involvement in medicine beyond FI. Full time is not necessary, but there is a great deal of fulfillment that can be achieved when you strip your practice down to just the portions that engage you mentally and provide you enjoyment.