This is an assumption I'm working under, but I've thought about it for a more normal case as well.
Still, the usual advice for saving for a normal retirement is 10%-15%, and you only have to break $185k before a 401(k) doesn't cover even the low end of that.
Also, if you're making that much, even if you want to retire early, the normal % rules of thumb don't necessarily apply, assuming you want to live a normal middle-class life in retirement. You should run the numbers on http://firecalc.com, you will find if you live frugally making that much and contribute the max you can easily retire in under 20 years with a >90% chance of success. If you want to retire to the high life you will either have to contribute more than normal(and invest well/be lucky) or work longer, no matter your income.
Edit: I will say that there is a potentially significant disadvantage, especially for high earners, in having a lot of your net worth tied up in a 401k. That is required minimum distributions, essentially forcing you to take out a certain percentage of your account balance when you reach certain age thresholds. You can somewhat easily get around this by rolling over into a Roth IRA(backdoor Roth), but that could offset many of the tax advantages of the 401k in the first place if you have significant traditional IRA holdings[1]. This is mostly deleterious if you are planning on bequeathing an estate in a tax-advantaged way, but you may be able to get around it with a irrevocable trust. Consult a fiduciary, this is not financial advice.
1. https://www.bogleheads.org/wiki/Backdoor_Roth_IRA#Caution