IMHO this strategy works very well if you have good amount of capital. Price swing doesn't guarantee a good profit compared to long term hodling and expert day trading .
there are sometimes big swings in a matter of hours but not that often.
Yeah, It only happen unexpectedly that you'll going to regret for not monitoring the market movements.
This is more like long term trading. It is also dangerous if you setup unreal goals and the greed plays a big role as well you need to control it and make reasonable TA.
This is also true base on experience and concerns from the other traders.
Since OP mentioned about patience, I guess it would be better to hodl long term and stablish good target, and of course don't let greed exceeds your target.