Streptocarpus ionanthus
African violets like evenly moist soil, but their crowns rot if kept wet. Many growers water from the bottom so water never lands on the leaves.
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Water when the soil reaches this point
How it shifts through the year
Either works if you keep water off the leaves and crown. Bottom watering is popular because it avoids spots and rot at the crown.
Both thirst and rotted roots cause limp leaves. Feel the soil. If it is dry, water. If it is wet, check the roots.
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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.