Our standard is that a person should be able to swim 300 yards non-stop, and swim all four competitive strokes legally and 2 additional types of swimming, to be considered a "swimmer." 300 yards is important. Scientists have found that humans can swim 200 yards without being able to breathe effectively. But without the ability to breathe effectively, eventually that person will get in trouble, and possibly endanger their life. We went 1/3 beyond that point to set our standard of 300 yards of non-stop swimming.
That goal won't be quickly achieved.
It takes time.
But it can save a life.
That's worth the investment of time.