I know a profitable futures prop trader who had a 70:1 RRR in one year, so his profits was 70 times bigger than his max DD in one year on a non-remote prop trading firm. One of his strategies I have seen he was trading live by looking over his shoulder several years ago but this strategy already stopped working. So in conclusion a 6:1 RRR per month is possible to translate this further that makes it possible to make a 1:1 in ca. 3 trading days which is the requirement of most prop firms phase 1 challenge. But it is NOT possible to do this in average only by 1 trade, then you (usually) only got lucky. So with a bit of luck passing in 1 day is possible with not to far from being unrealistic but not only with 1 trade. That is why the number of trades in a challenge are much more important than the trading days. I am also thinking of traders waiting for high probability setups or special situations that does not occur on every (second) trading within one month.
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