Zamioculcas zamiifolia
ZZ plants store water in thick underground rhizomes, so they tolerate long gaps between waterings. Rot from too much water is far more likely than thirst.
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Water when the soil reaches this point
How it shifts through the year
A ZZ plant can go weeks without water because the rhizomes store it. A long dry spell is safer than soggy soil.
Overwatering is the most common cause. Let the soil dry out fully and check that the pot drains.
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Estimates use rules of thumb. Always confirm with your finger: push it about an inch into the soil before you water.