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Will_Sawin comments on Action and habit - Less Wrong
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30 minutes a week does something, I'm sure. Not sure if you can get cardio with just lifting weights. I like having good cardio because it allows me to do things like, say, run all the way to the bus stop if I'm late or bike 3 hours in a day if that's what my schedule demands. I'm sure your potential for injuries is lower than mine...I seem to suffer one minor injury after another, and that's with swimming, pretty much the lowest-impact sport ever.
Also I'm pretty sure you can't improve your swimming times with half an hour once a week. Or running, skiing, cycling, etc...
Shouldn't you improve to a plateau? At least in the limiting case where you have not swum at all in a while?
It's true that half an hour a week is enough to learn a few technique changes that can make the stroke more efficient, and thus faster. But even my adult private lessons, who come once a week for a half-hour of stroke correction plus another few times a week to practice, rarely improve their two-length (50 m) time by more than a second or two. Improving your swimming technique takes more than knowing what to do.