Signals are either wrong, late or early. So it depends.
That is why you spend a lot of time working on POST-signal tactics. In general, you don't want to wait through a drawn down larger than your profit factor x expected profit x risk tolerance.
e.g. you expect to pull in $300 on the trade, your system profit factor is 4 ($4 win per $1 loss). Than means a $75 drawdown is "normal". Then you say, will I am a wild crazy risk seeking dude, and triple that. So 225 is your "new normal risk tolerance" expectation. If you post-entry tactics allow, say $900 drawdown, that profit facto of 4 won't hold up.
Note this is different than a simple R:R ratio because you have an actual track record for profit factor to base it upon. Trades are actually entered and exited.
The problem with going in blind with a simple R:R, is that it has no basis in reality, i.e. it is not based on a 100's or 1000's of trades for the given signal PLUS, the actual exit.