You can get plants to live a long time with no care by sitting containers in a shallow pool of water. But the container has to be tall enough so that the mix doesn't stay too wet. Solo cups in about 1/2" of water is what I'm thinking. If you're still in cell trays, it's harder. It would be more like a tiny bit of water underneath them.
Temperature also plays a big role in water transpiration. The cooler it is, the longer the plants can go without being watered .
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