I think it depends too much on people's personal circumstances and aspirations to be able to answer it with numbers, to be honest.
I managed to start off my first funded account with a deposit of $3,000, after a very long time on demo, and at the time I didn't need to withdraw anything from it each month toward my living expenses (which was just as well, because what you can safely make in a month off a $3,000 account isn't worth talking about anyway!).
I think it's important to have realistic expectations, and to understand that "making monthly income" shouldn't be the primary goal of trading a small funded account - the three goals should be getting used to trading real money, avoiding drawdowns, and collating the outcomes of a large series of consecutive trades without making a net loss.
I think most beginning traders hugely "overstake", i.e. their position-sizing is much too high. What's sensible varies according to win-rate and R:R (both of which should be reliably tested and proven and known before starting) but I find it pretty hard to believe that any aspiring trader should be risking more than 1% of their account funds on any individual trade.
Just my perspective ...